Recent lighting technology is radically changing all this. Compact fluorescent lights(CFLs)use about 75 per cent less energy than standard incandescent bulbs and last up to 10 times longer. CFLs provide the greatest savings in fixtures that are on for a substantial amount of time each day. For this reason, they are typically used in guestrooms and corridors as well as well as in the back of the house. Due to major improvements over the last few years in their colour-rendering abilities, CFLs are now a viable alternative to incandescent lamps.