I 2nd Sparkies comment. I was doing some 'special' lighting with some Leviton reps when they came out with this stuff. (Hey, I hate to crow but that job still graces their catalogs) and they asked me if I would like to try 'em. that was a long time ago, I'm thinking 15 years, but geezy dizeezy steps in. Only had one fail, and they work great.
