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Luminous efficiency

Luminous efficacy indicates how many lumens a light source produces per watt and is therefore expressed in lumens per watt (abbreviated as lm/W).  It is related to the luminous flux, which is measured in lumens, as well as to the power consumption in watts. Simply put, luminous efficacy represents the efficiency of a light source. The higher the value, the more efficiently a light source converts the energy it receives into visible light. Typical values for luminous efficacy include, among others:

  • General-purpose incandescent light bulb, 12 lm/W
  • Halogen lamp, 18 lm/W
  • Energy-saving light bulb, 66 lm/W
  • Fluorescent lamp, 104 lm/W
  • LEDs 134 lm/W

Lumens provide an excellent basis for comparing lamps. This also clearly illustrates why incandescent bulbs were banned due to their poor energy efficiency. With just one watt of power, an incandescent bulb produces only 12 lumens, whereas an LED bulb with the same wattage produces a full 134 lumens. LEDs are therefore among the most energy-efficient and effective lighting options.

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