I got myself this RGB 100W power LED, a heatsink with fan, and some thermal paste. I put the LED on the heatsink, with the thermal paste. It is bright at 10mA/color, and all the colors seem to work well, and the individual LEDs are evenly lit. At 500mA, each color is very bright. I will try it at 1A, the maximum rated current, and see what happens. Unfortunately, I do not have the power resistors to try all of them at that current. But I am confused. R and G are 1A 30-34V, so about 66W. But then, red is 22-24V, so at 1A, only ~22W. This totals at 85-90W. Are they just rounding up to make it seem more powerful, or am I missing something?

 

Do they offer an actual datasheet ? If not your answer may go
unanswered.

Regards, Dana.

 

I don't think so. Just this.

 

Numbers like that are almost always rounded to "nice" values. First, they are going to use the max voltage and max current -- so that gets you to 92 W. Then they will probably point to some document showing that the actual max current is a bit more than 1000 mA (after all, there's nothing magical about exactly 1 A -- that's just a convenient number to use for the operating current). After all, if they can run it at just 1% over 1 A, there's your 100 W. But they probably don't have to do that, even. They'll just say that they rounded to the nearest 10 W and tell you that if you have a problem with that, you can take it up with their lawyers.

 

Numbers like that are almost always rounded to "nice" values. First, they are going to use the max voltage and max current -- so that gets you to 92 W. Then they will probably point to some document showing that the actual max current is a bit more than 1000 mA (after all, there's nothing magical about exactly 1 A -- that's just a convenient number to use for the operating current). After all, if they can run it at just 1% over 1 A, there's your 100 W. But they probably don't have to do that, even. They'll just say that they rounded to the nearest 10 W and tell you that if you have a problem with that, you can take it up with their lawyers.

It seems otherwise decent. But their "100W" IR LED is ~14V and 3500mA, yet magically "100W".

 

It seems otherwise decent. But their "100W" IR LED is ~14V and 3500mA, yet magically "100W".

Call or write THEM and ask about their specs. For all I know, they consider 100 W to be nothing more than the chosen name of a line of products.

 

They've just given approximate figures ... to drive this at 100W you need a fan assisted heatsink ....noisy , even then it will probably be too hot and not have a long life ...

Best to drive these well below max current you will have a much longer life and they operate more efficiently at lower currents , around 30% more lumens per Watt when run at 30% max current ,that's a sensible current with a good heatsink (no fan)

 

They've just given approximate figures ... to drive this at 100W you need a fan assisted heatsink ....noisy , even then it will probably be too hot and not have a long life ...

Best to drive these well below max current you will have a much longer life and they operate more efficiently at lower currents , around 30% more lumens per Watt when run at 30% max current ,that's a sensible current with a good heatsink (no fan)

I got a heatsink with fan, and used thermal paste. But I did notice it heating up quite a bit. I won't use 100% power, but 30% isn't enough.