(LEDs) are solid-state semiconductor devices that convert electronic
energy directly into light. LED's produce "cold" light,
which is very efficient because most of the energy radiates in the
visible spectrum. Incandescent, and to a lesser extent fluorescent
lamps radiate energy in the non-visible spectrum creating heat as
well as light.
By combining RGB (Red, Green,
Blue) LED's, it is possible to create an entire spectrum of colors as well
as white light - this is known as the "additive properties of light". Color
mixing is achieved by varying the voltages to each of the RGB color arrays.
The controller for this color mixing may be either an external unit or it
may be combined on or in the lighting unit itself.