The heat sink size calculator is based on a well established equation for estimating heat sink volume during the early stages of heat sink design.
Cree led heatsink calculator.
Heat sink 40 w.
Any led cooler which does better than a thermal resistance lower value of 3 11 c w in free air conditions would make that our led case temperature tc will remain below the required 75 c.
We can now write a formula for the junction temperature of any given led.
Cree s heat sinks provide a simple and cost effective method to improve the lmh2 thermal performance in various lighting applications.
In our experience it generally estimates the overall heat sink volume within 15 of a final design.
The power dissipated by the led p d is determined by multiplying the led s forward voltage v f by its forward current i f.
For all valid led drive currents the pct quickly and easily does the following.
Cree product characterization tool pct identifies the best cree xlamp leds for your design the cree product characterization tool pct allows you to select from multiple lighting system design parameters to compare up to three led models simultaneously to help in making critical design choices.
Thermal resistance model for a simple led lighting assembly.
Metalized vias in fr 4 pcbs.
A cob led module of 20x20mm for 20w or a cob led module of 40x40mm for 20w can have a total different heat conduction towards the heat sink so that is why some smd led down light keep 180mm.
Product categories xlamp leds.
Cree the thermal resistance between the led junction and ambient r th j a is the sum of these resistances.
Cree pioneered this led feature almost ten years ago to enable the use of 1 see the long term lumen maintenance application note.
Compare leds within each product family.
Cree leds xhp35 star xp l star xm l2 star xp e2 color stars xp e2 white stars xp g2 star xt e white star xt e royal blue star cxb 1310 hd array cxb 1520 hd array custom 3 up cree nichia leds 12v nichia 757 led nichia 157 led.
Heat sink 85 w.
Heat sink 30 w.
For certain illumination systems design thermal vias enable the use of fr 4 circuit boards.
Compare leds and simulate system performance.
Heat sink 70 w.
J series leds.
Temperature ww 0 020 0 015 0 010 0 005 0 000 0 005 0 010 0 015 0 020.
A reference link has been placed below the calculator for further reading.
Cree xlamp leds are designed with an electrically isolated thermal path.
So rth heatsink 3 31 c w 0 2 c w 3 11 c w maximal.
Find the right leds and led modules for your lighting needs.
