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2. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   A 230-volt incandescent light bulb ... Coiled coil filament of a 200-watt incandescent lightbulb highly ... Such a lamp may achieve up to 22 lumens per watt, compared ...

3. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   Tungsten light bulb, typical, 2800 K ... Halogen incandescent: 100, 200, 500 ... and the theoretical luminous [efficacy] is 95 lumens per watt. No substance is solid ...

4. Lumen (unit) - Wikipedia

   en.wikipedia.org/wiki/Lumen_(unit)

   Lamps used for lighting are commonly labelled with their light output in lumens; in many jurisdictions, this is required by law. A 23 W spiral compact fluorescent lamp emits about 1,400–1,600 lm. [4] [5] Many compact fluorescent lamps and other alternative light sources are labelled as being equivalent to an incandescent bulb with a specific ...

5. These are the best — and worst — lightbulbs for the planet

   www.aol.com/lifestyle/best-worst-lightbulbs...

   A standard 60-watt incandescent bulb equals 800 lumens. But you could have the same lumens with just 22 watts of LED light or 26 watts of CFL light.

6. Orders of magnitude (illuminance) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude...

   < 200 lux: Extreme of darkest storm clouds, midday 400 lux: Sunrise or sunset on a clear day (ambient illumination) 10 4: 10 kilolux: 10–25 kilolux: Typical overcast day, midday 20 kilolux: Shade illuminated by entire clear blue sky, midday 10 5: 100 kilolux 110 kilolux: Bright sunlight 120 kilolux: Brightest sunlight

7. Luminous flux - Wikipedia

   en.wikipedia.org/wiki/Luminous_flux

   Luminous flux (in lumens) is a measure of the total amount of light a lamp puts out. The luminous intensity (in candelas) is a measure of how bright the beam in a particular direction is. If a lamp has a 1 lumen bulb and the optics of the lamp are set up to focus the light evenly into a 1 steradian beam, then the beam would have a luminous ...