Try doing a little reading over at the DIY LED forum. Smo and Pop22 are the resident geniuses over there. Both really know their stuff cold. MY suggestion if you are really interested in checking this out I would start around page 10 in that forum and read my way backwards towards the front page. One of the nice things about reading backwards is that you get threads that have been solved and discussed (sometimes to excess) so that you can recognize what you are getting in to and how to handle it. If you go COBS you will definitely want to pay attention to your light heights a you can fry one like an egg if you are careless. And if done right they are pretty much the poor man's Porsche.