Energy-saving lamps also called compact fluorescent lamps (for short CFL lamp) has high photosynthetic efficiency (is five times of ordinary light bulb), obvious effect of energy conservation, long service life (8 times of ordinary light bulb), small volume, convenient to use. Its working principle and fluorescent lamp are basically the same.
Energy-saving lamps in addition to white (light), there are still warm light. Generally under the same wattage, an energy-saving lamp saving 80% energy than incandescent lamp, 8 times life expectancy extension, thermal radiation is only 20%.
Not strictly, the energy-saving light of a lamp 5 watts light can be considered as equal to 25 watt incandescent lamp, 7 watts of energy-saving lamp is approximately equal to 40 watts of light, 9 watt is equal to about 60 watts.