After a test purchase in November 2012, following testing, I decided to complete energy conversion of domestic lighting using Philips Tornado ESaver lights. Even if the lighting is reportedly involved only 15% of total energy consumption of the household, I think that the investment will pay off. The lights are always similar in design to a former light bulb, the base of the lamp in his stocky form fit (with one exception) in all existing lamps. The reached about 60 seconds full brightness is a 75 W conventional incandescent lamp not according to and in only 20% of energy consumption! Great thing, and not comparable with the cheap energy saving lamp from the house no name ". Also convinced that energy-saving lamps Master LEDspot 4W have me (bright as 35W) 827 (extra warm color) GU10 40 ° dimmable reflector lamp 50mm 230-240V which however do not come cheap are. For longer shelf life, I can express myself later. Buy!