One thing I have noticed, when most people switched to CFL's, most service calls I got were that they worked intermittantly in ceiling "can" lights- What was happening was the bult-in thermal overload was cutting out due to excessive heat generated by the intenal ballast. I'm curious to see how much heat the floods/par LED lamps give off.
Ive seen the heat sinks on some of these lamps and may soon have a flurry of new service calls......good for the pocket book, but would rather have a consistant, non annoying, flicker free light.
for what its worth....