Warm white LED is a solid semiconductor light source with warm white, which is able to transferred electrical energy into visible lighting. The core of warm white LED is semiconductor crystals, which consist of a P semiconductor and an N semiconductor, thus form a p-n junction. Warm white LED adopts InGaN and AlGaInP material with heat-resistant, corrosion-resisitant, impact-resistant and anti-aging. In contrast to most light sources, it has many benefits which include low-power consumption, high intensity, uniform illumination, solid static, high shock-resistant, major reduction in power cost, no RF interference, maintenance free, easy installation, long life and so on. Moreover, warm white LED doesn't contain mercury, unlike fluorescent lamps. It is small size and can be used by combining with other electrical component such as sensor, dimmers and lighting control. When it concerned to the applications, warm white LED is intended for numerous lights including decorative lamps, traffic lamps, craft flashlight, headlights, city beautification of night piece and more.