high power LED grow lights M.k2

Step 7 LED Current Limiter 3

You'll probably need a heat sink on the MOSFET of the current limiter circuit. Now here's the catch, you cant have the 2 MOSFET's attached to the same heat sink, as the tabs tend to be at different voltages, and unless you can insulate them, you'd end up with some nasty short circuits and erratic behaviour.

I made 2 aluminium heat sinks attached together with a piece of perspex, which was then mounted inside the box making sure the heat sinks didn't touch any part of the inside of the box.
This set-up got really quite warm after extended use and I would highly recommend using larger heat sinks or some kind of cooling.

Comments

[timdgoodpaster]

 build in a container that has a clear window.  Fill with de ionized water.  Or use mineral oil (baby oil).