Firebrand
Active member
Gonna throw this into the thread for those who are interested in heat dissipation.
Below is a small primer on matching COB's to drivers.
There is a rough formula of for the temperature rise.
As a very rough "rule of thumb" you need 1 sq inch of surface area exposed to the open air for every watt of LED on the heat spreader (Heatsink) w/o fan forced cooling.
With a cooling fan in operation you will be well within the parameters of the required cooling temps @ 1 sq inch per watt.
Below is a small primer on matching COB's to drivers.
http://www.digikey.com/product-search/e ... 00N00V427F
Looking at page 17 of the LED data sheet you could run maximum current (2.4 amps) if you had to. But to insure long life of the chip 75% of that or 1.75 amps would be a prudent number.
Then looking at page 9 of the data sheet you can see Vf (forward voltage) of the LED at 1.75 amps is around 38 or 39 volts. After that it's just a search for a driver to match 1.75 amps and at least 39 volts.