 White LEDs are similar in most respects such as power and durability, but utilize a two-stage process to create the white (polychromatic, or broad spectrum) light.In the first stage, the LED produces one color of light, similar to any other LED.In the second stage, some of the blue or violet-blue is absorbed by a phosphor, which fluoresces yellow, imitating the broad spectrum of colors which the eye perceives as "white".