Hello,
I’m looking for a recommendation on a heatsink for a lighting application. I have a 10" x 10" grid of LEDs with a total DC wattage of about 430W. As i understand from other discussions about 40-50% of that power will be thermal power (175W-200W). It’s a natural convection application with an ambient of 35C while trying to keep LEDs at a Tc of 65C or better (if possible). I’m looking for a recommendation on the type (extruded, folded fin etc.) and heatsink size.
thanks,
There are many thermal calculators out there where you enter in the degC/W for each item and it works out the math in trying to resolve if you can meet your thermal budget or not.
One example…
Maximum luminous efficacy is 683 lumens/watt. If the LEDs in question develop 120 lm/W, roughly (683-120)/683=82% of electrical input gets converted to heat, as a conservative estimate.
Divide the desired maximum temp rise by the thermal load to find a thermal resistance target; 30°C/200W = 0.15°C/W for example, which would be a rather aggressive target for a natural-convection application. Something like the 345-1962-ND might get one there…
thanks everyone for your feedback.
Very helpful. I’ll investigate further.
