- 4 MC-E K Bin LEDs running at 2.8A - Internally wired in P, 4 wired in Series
Hey guys, i have been trying to determine what size heat sink i will need to have behind these to keep them at a safe temperature. I have run across a crude calculation of
- Rise in temp C per watt = 50 / sqrt(surface area in sq cm)
- I have a 50 sq in heat sink which shows to be around 2.7C/watt
At an ambient of 10c and an LED efficiency of 15% (guessing) the heat sink would be at around 219F, this sounds way too high but here's my math using the crude results from above of 2.7c/w.
- 10c ambient + 2.7 * 40w * 85% inefficiency ) = 102c
Can someone let me know
Jason
Hey guys, i have been trying to determine what size heat sink i will need to have behind these to keep them at a safe temperature. I have run across a crude calculation of
- Rise in temp C per watt = 50 / sqrt(surface area in sq cm)
- I have a 50 sq in heat sink which shows to be around 2.7C/watt
At an ambient of 10c and an LED efficiency of 15% (guessing) the heat sink would be at around 219F, this sounds way too high but here's my math using the crude results from above of 2.7c/w.
- 10c ambient + 2.7 * 40w * 85% inefficiency ) = 102c
Can someone let me know
- What is a safe upper temperature for the heat sink nearest the LED - LED to Star board soldered - Arctic alumina star to heat sink
- What is efficiency of MC-E - How much of the ~40 watts will be turned into heat?
- How large of a heat sink will it take?
- What is the formula to determine heat sink size?
- For both static air and if you use a fan to move air across it - is the a formula taking into account cubic foot per minute?
Thank you for your help,- What is efficiency of MC-E - How much of the ~40 watts will be turned into heat?
- How large of a heat sink will it take?
- What is the formula to determine heat sink size?
- For both static air and if you use a fan to move air across it - is the a formula taking into account cubic foot per minute?
Jason