All LEDs use the same technology, but LED light modules offer a drastically different appearance than traditional LED light bulbs. Instead of the traditionally shaped bulb, LED light modules consist of one or more light emitting diode arranged on a board.

The major players in the LED packaging market are NICHIA CORPORATION (Japan), ams-OSRAM AG. (Austria), Samsung (South Korea), Lumileds Holding B.V. (US), Seoul Semiconductor Co., Ltd. (South Korea), MLS CO, LTD (China), EVERLIGHT ELECTRONICS CO., LTD. (Taiwan), SMART Global Holdings, Inc.

LED is a highly energy-efficient lighting technology, and has the potential to fundamentally change the future of lighting in the United States. Residential LEDs -- especially ENERGY STAR rated products -- use at least 75% less energy, and last up to 25 times longer, than incandescent lighting.

LED lights typically range from about 1650K at the warmest to about 6000K at the coolest. A CCT of 1800K to 2700K is generally desirable for a warm glow. A CCT of 4500K or lower usually looks crisp white, whereas a CCT of above 4500K or 5000K typically looks cooler white to blue.