The overall efficiency of LED lighting refers to the ratio of the total luminous flux of the lighting fixture to the overall power consumption of the appliance. In general, since LED lighting is affected by power loss and temperature rise, the overall luminous efficiency (combined efficiency) of the lighting fixture is 30 to 50% lower than that of the LED single.
Taking a white LED as an example, the reason why the overall efficiency of the LED lighting fixture is lower than that of the LED single light is as follows. First, when a white LED is used for a lighting fixture, the luminous efficiency is lowered more than the catalog value of the white LED. This is because the directory value is mostly the input pulse current, and the luminous efficiency in an ideal state in which the temperature of the light-emitting portion (active layer) of the LED hardly rises. However, many lighting fixtures are used in a state where a fixed current is input to the LED, and the temperature of the active layer actually rises. With this in mind, the luminous efficiency is reduced by about 20%. In addition, in a power conversion circuit that converts alternating current into direct current and supplies power to the LED, the power is reduced by about 10 to 15%. The illuminator is provided with a reflector and a lens to direct the light in the desired direction, in the process of losing nearly 10% of the light. Adding these together, the overall luminous efficiency of the lighting fixture is reduced by about 40% compared to the catalogue value of only the light source.
When a white LED is used for a lighting fixture, the luminous efficiency is much lower than that of the white LED. The directory value is mostly the luminous efficiency measured under an ideal state in which the temperature rise of the light-emitting portion (active layer) of the LED hardly occurs after the pulse current is input. However, since the lighting fixture is used in a state where a fixed current is input to the LED, the temperature of the active layer actually rises. Moreover, the light emitted by the light source is not completely emitted to the outside of the appliance. The overall luminous efficiency of the lighting fixture is reduced by about 40% compared to the catalogue value of the light source.
However, products with a combined efficiency of more than 80 lm/W have recently become commonplace. Although it is not possible to match the high-efficiency high-frequency (HF) lighting type fluorescent lamp whose overall efficiency is close to 100 lm/W, the back of the fluorescent lamp has been seen.
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