LED lighting differs from incandescent and fluorescent in several ways. When designed well, LED lighting  is more efficient, versatile and lasts longer. LEDs are ''directional'' light sources,which means they emit lght in a specific direction, unlike incandescent and CFL which enit light and heat in all directions. That means that LEDs are able to use light and energy more efficiently in a multitude off applications. However, it also means that sophisticated engineering is needed to produce an LED light bulb that shines light in every direction.Common LED colors include ambr, red, green, and blue. To produce white light, different color LEDs are combined or overed with  phosphor material that converts the color of the light to a familiar ''white'' light used in homes.Phosphor is a yellowish material that covers some LEDs.Colored LDs are widely used as signal lights and indicator lights,like the power button on a computer. In a CFL, an electric current flows between electrodes at each end of a tube containing gasses. This reaction produces ultraviolet (UV) light and heat.The UV light is transformed into visible light when it strikes a phosphor coating on the inside of the bulb. Incandescent bulbs produce light using electricity to heat a metal filament until it becomes '' white '' hot or is said to incandence. As a result , incandescent bulbs release 90% or their energy as heat.