Luminous efficacy
© Rainer Sturm / pixelio.de

Luminous efficacy

Luminous efficacy indicates how energy-efficiently a lamp operates. It states how much luminous flux (= lumens, lm) is produced per watt (= lumens per watt, lm/W). Some examples: The conventional incandescent lamp achieves about 12 lm/W; halogen lamps 20 lm/W; energy-saving lamps 60 lm/W and linear fluorescent lamps about 90 lm/W.

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