Energy Efficiency
The efficiency of a lamp can be expressed at best by the light output in lumens/watt . The higher the light power at the same power supply, the more effective the light source.
The luminous flux with the unit lumen refers to the entire visible radiation which is emitted by a light source. In contrast to the light intensity with the Lux unit, the luminous flux is independent of the size of the illuminated surface.
Currently LEDs are available with an efficiency of up to 150 lm / W (as of 10/08/09). Due to the manufacturing process, this value can not yet be made constant. Therefore it is a selection that is usually associated with relatively high acquisition costs. For the LEDscale® products emitting diodes are used in the range 80-100 lm / W, which are available at attractive rates even in large quantities.
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