Basic Definitions

LED

The LED system consists of several components. Without each other, these components have little commercial use. It's their performance when used together that separates LEDs from other technologies. The system starts with an LED light source. Other examples of light sources include HID, fluorescent and incandescent.

LED

An LED driver is a self contained power source that functions like a fluorescent ballast. It provides proper voltage and regulates current flow. LEDs need DC voltage. So the driver's function is to not only transform the voltage from the AC line voltage source, but to provide a constant current level and protect against fluctuations in the line voltage.

Multiple LEDs are combined into arrays. The number of LEDs and placement of the array in the lamp or fixture will depend on the photometrics desired.

LED

The luminaire (or fixture) is the final component. This is the surrounding materials constructed for optical and thermal control of the overall system. Again, this is very similar to traditional lighting systems where the light is manipulated (i.e. by lenses, reflectors, refractors) to get the desired light levels in the desired areas.