LED lamps to achieve high luminous efficiency

　　LED beam angle is usually 15 ° to 180 °, which can accurately control the light such that the loss of light in the cavity of the lamp is minimized. This is significantly different from the traditional sources of local, traditional light sources emitting angle is usually very wide, and many do not need light to escape in the direction. This means that, when using the LED light source, use less light can reach the same level of illumination, reducing energy consumption.

　　On the other hand, LED lighting capacity itself is stronger, that is, higher luminous efficiency. Incandescent optical conversion rate was about 5%, fluorescent 30%, LED 40%. Another measure is the value of the luminous efficiency of the light source, the light is converted to electric power of 1 watt efficiency of luminous flux in units of lm / W. The mid-1990s the first one white LED luminous efficiency is probably 0.1lm / W, now commercial cool temperature white LED, luminous efficiency has reached 160lm / W, laboratory data has more than 250lm / W (CREE declared laboratory data has been reached 303lm / W), illustrate the potential of the LED is enormous.