I noticed the number 40 Led's, if you are planning to hook 40 in series and power it off of rectified houshold current, I have a word of caution. I tried this a while back and it didn't work out so well. Diodes short by failing, and thus with the first failure, the current and the voltage drop across the surviving diodes causes them to fail. If this is what you have in mind, I would recommend converting to 12 volt DC through a switching supply if possible, or a transformer and connecting three in series through a resistor to limit the current to under the rating for the LED's, probably a 120 ohm or so for the common 5mm type. This is safer, and if one string fails, your only out 3 LED's. Also, keep in mind that LED lighting in its current state is still much less efficient than flourescent lighting, see the lighting link off the other power home page. Rich Hagen