50 Watt LED Lamp for Accurate Color Reproduction


I’m an oil painter, and for a long time I’ve been unable to work at home because our interior lighting is both too dim, and too “warm”. Colors that are seen under unnatural lighting don’t look right. Painting under the wrong light is — in a sense — painting blind to some colors. In the past, broadband lighting required hot, inefficient incandescent floodlights, because LED’s did not produce an even spectrum of light. But advances have been made. LED lighting is characterized by a “CRI” number – color rendition index, in which perfect color reproduction rates 100. There have been high accuracy LED’s with a 90 CRI rating for a while, but recently high power LEDs with a 95 rating have become available. Some manufacturers have been offering these 95 CRI light bulbs for artists at an expensive price, but I decided to save money by buying the LED’s from an industrial supply house and building my own. This way I could make a single dimmable unit with very high power, optimum color purity, and not have to use awkward “bulbs”. The 95-CRI LED’s cost about four times as much as the 90-CRI LED’s – this gives manufacturers a terrible temptation to cheat and use fewer of the 95-CRI parts than they should, just to save money, so the do-it-yourself route for me is the way to go. I think it is very likely that some of the expensive LED lights for sale by unscrupulous sellers are not as advertised, just because the consumer cannot do spectral measurements to verify what they are buying.

I chose these L128-5095HA35000B1 parts, and bought 200. Like the LED’s in my previous project, these have a nominal 3 volt rating, so a string of 50 gives the right voltage for a 158V full wave rectified 112 VAC. Three such strings in parallel, each string about 15W, gives almost 50W total, and that should give about as much light as a 250W incandescent floodlight. I picked up a cheap clamp-on heat lamp fixture from Ace Hardware ($17) and a plastic project box, and was ready to go.

My previous design had no protection against overvoltage causing overheating and burnout, so back to the LTSpice simulation to improve it. This time, I went with a simple Zener diode to supply a 6.2V reference, and added a transistor to shut down the power FET if the input voltage got too high, and thermally bound it to the main FET so that it would also act to some extent as a thermal shutdown device. Here is the LTSpice drawing. Remember these are modeled devices, not actual devices. The original LTSpice drawing file appears at the end of this article. Yes, there are 150 LED’s! Click on it to enlarge.

Here are the simulation results. The green trace shows current through the LED’s, and the parts values are chosen to allow about 450 milliamps (Id(M1) when the rectified AC results in DC voltages (V(n001)) in the range of about 153 to 158. The red trace shows total device power dissipation in the MosFET, demonstrating that the shutoff circuit prevents it from getting too hot when the DC voltage goes very high. The shutoff circuit also should begin limiting current when it gets hot, because the Q1 junction acts as a temperature sensor, dropping in forward voltage by over 2 mv per C degrees.

Designing the circuit this way is easy, since changing a few parts values gives quick answers. But the fundamental problem with this kind of circuit is that the parts values (such as in the potentiometer chain) depend on the turn-on voltage of the MosFET, which varies a lot from device to device. Building this kind of circuit is fast and simple, but resistor selection is needed to give optimum operation. Two resistors need to be selected in the schematic. (See my final circuit for a more reproducible design.)

Adjust the value of R3 so that the average voltage across each LED is about 2.76V when the pot is at maximum, to prevent overdriving of the LED’s. Adjust R5 so that shutoff does not occur until just a little higher than nominal 115VAC mains voltage. Under some conditions, R6 might need adjustment too so that the 10K pot goes low enough to turn off the LED array. Clearly, these adjustments might be OK for a hobbyist, but for a high volume product this would never fly. Additional complexity would be needed.

I decided to mount the LED’s on 5 pcb’s, arranged in a pentagonal design. So, with 150 LED’s total, each pane would have 30 LED’s, which would be 10 LED’s in each of the 3 parallel strings. It was fun figuring out how to arrange them best, and cutting the pattern in the PCB using a Dremel tool and a thin diamond wheel. Soldering the LED’s in place took some practice — I damaged 10 or so in the first 30. The key seems to be in preparing the surface for the LED beforehand with a little solder, then placing the LED exactly at the right spot, then heating the surface near the IC so that the heat flows to the part and does the soldering without having to manipulate the part manually. Also note that the copper layer is tinned — I had to do this by hand. This was for two reasons (1) improved ability to solder the LED’s, (2) the copper color would have contaminated the color spectrum of the reflected light. (Technique: first apply some liquid Zinc Chloride flux to the surface, then wipe a hot solder wetted copper braid over the surface using a 700+ degree soldering iron.)

The five panels were then assembled into the full array:

The dimmer and drive circuitry were assembled into a small plastic box. I attached the power FET to a heatsink, just in case cooling would be needed, but it turned out that no air circulation holes were needed.

Here’s the finished LED lamp. It is VERY bright, and the purity of the light is excellent! It’s a pleasure being able to turn up and down the brightness using the control box. This photo was taken at low power, and it’s still so bright that artifacts are all over the image. I set it up so that it illuminates my work bench where I will be oil painting, and I’m very happy with the brightness of the colors. It feels like the noonday sun is shining through a window.

LTSpice listing. Copy the text below and save as “Ledlight21.asc” and then open the file in LTSpice.exe.

Version 4
SHEET 1 7116 980
WIRE 3808 -560 2208 -560
WIRE 5344 -560 3808 -560
WIRE 6912 -560 5344 -560
WIRE 2768 -512 2544 -512
WIRE 3072 -512 2848 -512
WIRE 3392 -512 3168 -512
WIRE 3712 -512 3488 -512
WIRE 3808 -512 3808 -560
WIRE 4304 -512 4080 -512
WIRE 4608 -512 4384 -512
WIRE 4928 -512 4704 -512
WIRE 5248 -512 5024 -512
WIRE 5344 -512 5344 -560
WIRE 5872 -512 5648 -512
WIRE 6176 -512 5952 -512
WIRE 6496 -512 6272 -512
WIRE 6816 -512 6592 -512
WIRE 6912 -512 6912 -560
WIRE 1392 -128 1216 -128
WIRE 1600 -128 1392 -128
WIRE 2208 -128 2208 -560
WIRE 2208 -128 1600 -128
WIRE 2208 -96 2208 -128
WIRE 1600 -64 1600 -128
WIRE 2096 16 1904 16
WIRE 2208 16 2208 -16
WIRE 2208 16 2096 16
WIRE 1216 64 1216 -128
WIRE 2208 64 2208 16
WIRE 2768 128 2768 -512
WIRE 2848 128 2768 128
WIRE 3072 128 3072 -512
WIRE 3168 128 3072 128
WIRE 3392 128 3392 -512
WIRE 3488 128 3392 128
WIRE 3712 128 3712 -512
WIRE 3808 128 3712 128
WIRE 4304 128 4304 -512
WIRE 4384 128 4304 128
WIRE 4608 128 4608 -512
WIRE 4704 128 4608 128
WIRE 4928 128 4928 -512
WIRE 5024 128 4928 128
WIRE 5248 128 5248 -512
WIRE 5344 128 5248 128
WIRE 5872 128 5872 -512
WIRE 5952 128 5872 128
WIRE 6176 128 6176 -512
WIRE 6272 128 6176 128
WIRE 6496 128 6496 -512
WIRE 6592 128 6496 128
WIRE 6816 128 6816 -512
WIRE 6912 128 6816 128
WIRE 2544 176 2544 128
WIRE 4080 176 4080 128
WIRE 4080 176 2544 176
WIRE 5648 176 5648 128
WIRE 5648 176 4080 176
WIRE 2208 240 2208 144
WIRE 2544 256 2544 176
WIRE 2208 336 2208 320
WIRE 2352 336 2208 336
WIRE 2496 336 2352 336
WIRE 2208 352 2208 336
WIRE 2352 512 2352 336
WIRE 2352 512 1776 512
WIRE 1776 592 1776 512
WIRE 1600 640 1600 16
WIRE 1600 640 1488 640
WIRE 1712 640 1600 640
WIRE 1904 672 1904 16
WIRE 2096 672 2096 16
WIRE 2544 672 2544 352
WIRE 1600 688 1600 640
WIRE 2208 688 2208 432
WIRE 1392 704 1392 -128
WIRE 1488 704 1488 640
WIRE 1216 816 1216 144
WIRE 1392 816 1392 768
WIRE 1392 816 1216 816
WIRE 1488 816 1488 768
WIRE 1488 816 1392 816
WIRE 1600 816 1600 768
WIRE 1600 816 1488 816
WIRE 1776 816 1776 688
WIRE 1776 816 1600 816
WIRE 1904 816 1904 736
WIRE 1904 816 1776 816
WIRE 2096 816 2096 736
WIRE 2096 816 1904 816
WIRE 2208 816 2208 768
WIRE 2208 816 2096 816
WIRE 2544 816 2544 752
WIRE 2544 816 2208 816
WIRE 1216 848 1216 816
FLAG 1216 848 0
SYMBOL voltage 1216 48 R0
WINDOW 123 24 124 Left 2
WINDOW 39 -54 916 Left 2
WINDOW 3 -144 885 Left 2
SYMATTR SpiceLine Rser=.03
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SYMATTR Value 300000
SYMBOL cap 1472 704 R0
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SYMATTR Value 1e-6
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SYMATTR Value IXFX90N30
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SYMATTR Value 5
SYMBOL LED 2528 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 2528 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2528 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D3
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2528 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2528 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2528 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 2528 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2528 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2528 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 2528 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 2832 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D11
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2832 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2832 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D13
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2832 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D14
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2832 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D15
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2832 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D16
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2832 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D17
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2832 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 2832 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D19
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 2832 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D20
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D21
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D22
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D23
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D24
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D25
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D26
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D27
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D28
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D29
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3152 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D30
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D31
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D32
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D33
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D34
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D35
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D36
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D37
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D38
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D39
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3472 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D40
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D42
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D43
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D44
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D45
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D46
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D48
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 3792 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL res 2192 -112 R0
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SYMATTR Value 100000
SYMBOL cap 1888 672 R0
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WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 4064 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4064 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4064 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 4064 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
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WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4064 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 4064 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4064 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 4064 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
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WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Type diode
SYMBOL LED 4368 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Type diode
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WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Type diode
SYMBOL LED 4368 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4368 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Type diode
SYMBOL LED 4368 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Type diode
SYMBOL LED 4368 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Type diode
SYMBOL LED 4368 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 4368 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Type diode
SYMBOL LED 4368 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 4688 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Type diode
SYMBOL LED 4688 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4688 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4688 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 4688 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
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SYMATTR Type diode
SYMBOL LED 4688 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4688 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4688 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4688 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 4688 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
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SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D81
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D82
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D83
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D84
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D85
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D86
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D87
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D88
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D89
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5008 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D90
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D91
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D92
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D93
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D94
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D95
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D96
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D97
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D98
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D99
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5328 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D100
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D101
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D102
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D103
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D104
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D105
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D106
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D107
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D108
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D109
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5632 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D110
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D111
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D112
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D113
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D114
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D115
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D116
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D117
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D118
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D119
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 5936 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D120
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D121
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D122
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D123
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D124
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D125
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D126
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D127
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D128
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D129
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6256 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D130
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D131
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D132
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D133
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D134
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D135
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D136
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D137
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D138
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D139
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6576 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D140
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 -512 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D141
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 -448 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D142
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 -384 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D143
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 -320 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D144
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 -256 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D145
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 -192 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D146
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 -128 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D147
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 -64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D148
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 0 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D149
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LED 6896 64 R0
WINDOW 0 -49 30 Left 2
WINDOW 3 80 31 Left 2
SYMATTR InstName D150
SYMATTR Value LXK2-PW14
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL zener 2112 736 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D151
SYMATTR Value TDZ6_2B
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 1376 704 R0
SYMATTR InstName C3
SYMATTR Value 120e-6
SYMBOL res 2192 48 R0
SYMATTR InstName R1
SYMATTR Value 2740
TEXT 1256 896 Left 2 !.tran 0 3 0 .01 startup
TEXT 2616 720 Left 2 ;2 watts
TEXT 2240 8 Left 2 ;1/4 W
TEXT 1632 32 Left 2 ;1/8 W
TEXT 2216 216 Left 2 ;10K pot
TEXT 2264 320 Left 2 ;Grn
TEXT 2224 464 Left 2 ;Yel
TEXT 2160 216 Left 2 ;Blu
TEXT 2552 216 Left 2 ;Blk
TEXT 2216 -256 Left 2 ;Red

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4 thoughts on “50 Watt LED Lamp for Accurate Color Reproduction

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