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(LuMens per Watt) A measurement of luminous efficacy, which is the light output in lumens using one watt of electricity. Following is an approximate range of lumens per watt for popular light bulb technologies. The higher the number, the less costly to run the lights. See lumen, incandescent bulb, halogen bulb, fluorescent bulb and LED bulb.

Bulb      Lumens Per 1 WattType           (Lm/W)

 Incandescent   10-18

 Halogen         9-25

 (CFL) Compact
  Fluorescent   42-75

 Fluorescent    35-125

 LED            40-200
References in periodicals archive ?
Green Creative has achieved an efficacy of 68 lumens per watt for an MR16, 20-W replacement.
Maybe they can go from the current level, 15 lumens per watt, to 30.
Among DOE's goals: LEDs that produce at least 150 lumens per watt in commercial units.
At 15 lumens per watt, the standard 60-watt incandescent bulb is the Hummer of light.
Cree reports that the LED efficacy was measured at 276 lumens per watt, at a correlated color temperature of 4401 K and 350 mA.
With up to 52 delivered lumens per watt, it is an ultra-miniature 1-3/8 in.
These cost reductions will be achieved while enabling outputs in excess of 150 lumens per watt - a combination that will allow Plessey to offer the most cost effective solutions in the HB LED industry.
These packages can produce 100 lumens per watt, making them ideal devices for light bars, light tubes, and omni-directional light bulbs.
Laser lighting generates 170 lumens while standard LED lighting generates around 100 lumens per watt.
8 lumens per watt (LPW) versus the incandescent 50-watt R20 at 7.
Cree is also raising the bar by increasing the efficacy of the standard CR family to 100 lumens per watt.
Color temperatures include 2200K, 2700K, 3000K, 3500K and 4000K with a CRI up to 97, lumen output up to 2104 lumens, an efficacy up to 77 lumens per watt, and a CBCP up to 15,930.