Energy saving lamps also called compact fluorescentss save energy by using the same technology as a fluorescent tube to generate equivalent light outputs to a conventional tungsten bulb but with a significantly lower power input requirement Due to the technology used they also offer huge increases in life expectancy over conventional lamps The marked rated wattage of all energy saving lamps is much lower than the equivalent conventional lamp The actual light output when compared is as follows Energy Saving Lamp Conventional Lamp 8 Watt 35 Watt 12 Watt 65 Watt 15 Watt 75 Watt 20 Watt 100 Watt 25 Watt 120 Watt Bulb Type E27 R8011 Watt