I can sympathize with "she changed her mind" Fortunately for me I had ripped out the old drywall to the studs and have switched outlets in my cabinets. Anyway, good luck next time
3. The hotter they get the shorter the lifetime. The service lifetime halves for each 10°C rise above ambient. This is a manufacturer's tradeoff. They might be more efficient (watts in vs. light out) at higher temps.
there are many creative LEDS in www.elementalled.com