[quote author=Jack Christensen link=topic=128022.msg962913#msg962913 date=1350660980]Actually, I might use the 170V peak voltage for the calculations anyway, so string up 50 LEDs instead of 36. [/quote]Careful there. I believe the spec allows line voltage to be anywhere from 108 to125VAC. Indeed, the lights at my house dim whenever a heavy load is switched in (electric oven, dryer, etc). Make sure you have a little voltage headroom to make sure all of your LEDs are fully lit even under poor line conditions.