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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 ?
All else being equal, a lamp that produces 30 lumens per watt is better than one which produces 20 lumens per watt.
Also opposed to outright bans on incandescent bulbs are Energy Star officials, who favor technology-neutral regulations based on lumens per watt, citing consumer choice and the time needed for market transformation.
Energy efficiency can go up to 105 lumens per watt.
Even though they're still being improved, LEDs are already in the efficiency range of fluorescent tubes, and researchers predict that they'll ultimately deliver about 150 lumens per watt in commercial applications throughout a projected lifetime of at least 70,000 hours.
At 15 lumens per watt, the standard 60-watt incandescent bulb is the Hummer of light.
By using GE's exclusive silver-coated reflector technology and the company's thin-film HIR filament tube design, the Retail HIR delivers up to 42 percent more lumens per watt than standard halogen.
They provide higher light output in confined applications and more usable lumens per watt.
Several light sources and systems are listed along with their mean lumens per watt, luminary usage, and types of school spaces where they would be used.
A lumen is a measure of light; lumens per watt describes the overall efficacy of converting electrical energy into light.
This significant milestone exceeds Cree's previous R&D industry record of 254 lumens per watt and demonstrates Cree's continued commitment to innovate and accelerate the adoption of LED lighting.
Tenders are invited for Led Retrofit Tube 4 Feet Long 16 Watts 170 To 230 Volts, Suitable For T8 Tube, Colour Temperature 6500 K, 180 Degree Angle, 110 Lumens Per Watt, Total Lumens 1760.
That provides a system efficacy of only 17 lumens per watt, which is really the kiss of death in today's efficacy-conscious world.