I'm working on several projects to drive quite a large number of 1-3watt LEDs for commercial lighting, and the constant snag I run into is powering them. The down conversion from line level AC to stable 12volt keeps adding to to a significant cost to the project.
Then is caught me as I slapped myself in the forehead watching a friend brag about all the LEDs he installed in his rather fugly computer: why not use a computer PSU since they are already a well known 12 volt regulated supply? (at least the good ones). If nothing else is running on the 5volt rails with significant load it looks like most decent PSU brands can easily handle sustained current loads at 12volt for at least half their commercial rating. 150watt at 12volt could run a heck of a lot of Crees at 700ma, and be absurdly cheap given we typically throw them away with the computer case. Using additional current regulation, (if it's needed) on the 12volt side is what I also need advice on.
"So, why not use Xitanium"
(2) Little competition
(3) #2 explains #1
(4) I can't do what everybody else is doing and prefer to learn by fire
Thoughts, ridicule, advice?