Exellent work!
I going to have to try these out. I like the high intensity from a small emiter. Great lighting effects.
Yep, LED's put out lots of heat. For the folks that don't know how to figure out the heat load the calculaton is a simple Ohm's law calculation. Per LED the waste heat is voltage across the LED times the current through the LED. Voltage in volts, current in Amps.
As an example, say that Gomer cranks up the LED's to 1amp. The power disapated using the typical voltage numbers from Phillips goes like this...
3.72 volts time 1 amp for a power of 3.72 watts for each LED. As there 12 LED's in use the total power disapation is 3.72*12 or 44.6 watts. This is a lot of heat to get rid of. If the LED's are at the max voltage that Phillips specs, the total watts would be 1*4.95*12=59.4 watts.
Another angle to keep in mind is solid state devices need to be kept quite cool compared to other variations of light generators. The lower the maximum temp, the larger the thermal emiter (heat sink) needs to be to get rid of the heat.
This much heat just about guarantees that a fan cooled hood will be nessasary.
Enough rambling for now.
Gary |