Typical Examples of Luminous Efficacy

While we’re on the subject of luminous efficacy (lumens of light output per watt of power consumption), I thought I would borrow a page (almost literally) from wikipedia and post some typical luminous efficacy numbers for various light sources since this seems to come up in lighting circles. πŸ™‚


The following table lists overall luminous efficacy and efficiency for various light sources:

Category Type Overall
luminous efficacy (lm/W)
luminous efficiency
Combustion candle 0.3 0.04%
Incandescent 5 W tungsten incandescent 5 0.7%
40 W tungsten incandescent 12.6 1.9%
100 W tungsten incandescent 17.5 2.6%
glass halogen 16 2.3%
quartz halogen 24 3.5%
high-temperature incandescent 35 5.1%
Fluorescent 5–24 W compact fluorescent 45–60 6.6%–8.8%
34 W fluorescent tube (T12) 50 7%
32 W fluorescent tube (T8) 60 9%
36 W fluorescent tube (T8) up to 93 up to 14%
28 W fluorescent tube (T5) 104 15.2%
Light-emitting diode white LED 26–70 3.8%–10.2%
white LED (prototypes) up to 150 up to 22%
Arc lamp xenon arc lamp 30–50 4.4%–7.3%
mercury-xenon arc lamp 50–55 7.3%–8.0%
Gas discharge high pressure sodium lamp 150 22%
low pressure sodium lamp 183 up to 200 27%
1400 W sulfur lamp 100 15%
Theoretical maximum
(monochromatic 540×1012 Hz,
approx. 555 nm, green)
683.002 100%

If you want a good explanation of luminous efficacy, click here read the full definition at wikipedia

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