Category Archives: F.A.R.M.

Building A Constant Current Driver For High-Power LEDs

By | December 23, 2013

Highly efficient, very powerful LEDs like the Cree XML2 are relatively inexpensive, and have lots of interesting uses.  According to Cree, they can “deliver[ ] an unprecedented 1198 lumens at 116 lumens-per-watt efficacy at 3 A,”1 with a maximum forward voltage somewhere around 3.15V.  To put this efficiency into perspective: incandescent lightbulbs have an efficiency… Read More »