I changed my theatre lights over to CFL and LED. Yeah you have to hunt and peck for dimmable versions of either...but... Since I did this in September(I replaced EVERY light bulb in and out of the house...went to Lowe's and spent close to $1200)...our electricity bill has dropped 40%. We keep outdoor house and barn lights...which is where most of the juice went. Barn went from 3500 watts in lights to 450. (we changed out some fixtures, 5 of them were 500w halogen/quartz) House went from 1400 down to 322. Most rooms went from 200-500 down to 40-90. Theatre room itself went from 1020 (17 60w bulbs) down to 136. Enormous difference.