Abbreviation of light emitting diode, an electronic device that lights up when electricity is passed through it. LEDs are usually red.

LED has many strong points:

1. Long life – lifetimes can exceed 100,000 hours, as compared to 1,000 hours for tungsten bulbs.

2. Size: typical package is only 5 mm in diameter.

3. Energy efficiency – up to 90% less energy used translates into smaller power supply required

4. Non-toxicity – no mercury

5. Versatility – available in a variety of colors

6. Cool – less heat radiation than HID or incandescent

7. Low voltage and DC – more secure in some applications