What are LED categories due to the color of light and luminous efficiency?

LED can emit light of different color temperature. It depends on numerous factors, mainly on the method of doping a semiconductor. Typical color temperatures of white light produced by LED are the following: 2700K, 3000K, 3300K, 4000K, 5400K, 6500K. It is not excluded that some manufacturers offer LED emitting light with other color temperatures.

LED also vary in terms of luminous efficiency. Nowadays LED of luminous efficiency from 30lm/​W to 150lm/​W are available. Lower values of luminous efficiency are presented by diodes with a lower power. In the laboratory conditions even higher luminous efficiency are obtained.

LED ligting system efficiency is smaller because it is calculated taking into account the “lost” power supply system values. LED which are offered nowadays are direct replacements of traditional bulbs and represent luminous efficiency in average from 50lm/​W to 70lm/​W. Such high luminous efficiency allow to obtain approximately 80% energy savings in comparison with the traditional bulbs, as well as, approximately 30% in relation to compact fluorescent lamps. It concerns only such LEDs, which represent A energy efficiency class. Energy efficiency class is indicated on the products or its packages. Energy efficiency class is not indicated for reflector light sources. It is important to pay attention on the fact that diodes emitting light of higher color temperature usually have higher luminous efficiency and give white light, even up to blue tint. Lower color temperature LEDs represent lower efficiency, but emmit warm color lighting.