Dan's Data Letter #159
Dan is back with more data than you can shake a stick at(now that's a lot of data!). In Letter #159, Dan jumps around from LED grow lights, to mercury in fish, and even covers a few things in between.
" Simple LED arrays with current limiting resistors rather than fancy driver hardware, all running from reasonably efficient power supplies (not hard to find these days - old PC PSUs will do it, though dedicated single-voltage switchmode boxes would be better), won't be terribly less efficient than the fancy commercial LED grow-lights. If you want to build an array big enough to light more than a science-fair quantity of plants, though, it still won't be cheap."
