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  2. Fluorescent-lamp formats - Wikipedia

    en.wikipedia.org/wiki/Fluorescent-lamp_formats

    Nominal length (ft) Nominal power (W) Lamp Code Notes T5 0.625, 16 4 49 F49T5 Retrofit replacement for 4 ft T5HO 54 W T8 1.0, 25 4 25 F32T8/25w Retrofit replacement for 4 ft T8 32 W T8 1.0, 25 4 28 F28T8 F32T8/28w Retrofit replacement for 4 ft T8 32 W T8 1.0, 25 4 30 F32T8/ES Retrofit replacement for 4 ft T8 32 W T8: 1.0, 25: 2: 17 F17T8

  3. Fluorescent lamp - Wikipedia

    en.wikipedia.org/wiki/Fluorescent_lamp

    A fluorescent lamp, or fluorescent tube, ... The typical luminous efficacy of fluorescent lamps is 50–100 lumens per watt, ... (10 to 25 W/ft) for T12 lamps.

  4. Lumen (unit) - Wikipedia

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

    A 470-lumen LED lamp. It consumes about one sixth the electrical power of an incandescent light bulb producing the same light. 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.

  5. Your Grow Light Is Probably Too Far from Your Plants ... - AOL

    www.aol.com/grow-light-probably-too-far...

    It seems like moving the lamp farther from the plant's leaves, for example, from 2 to 4 feet, isn't a big deal. ... foot candles, or lumens. ... fluorescent lights need to be 2-4 inches above the ...

  6. Orders of magnitude (illuminance) - Wikipedia

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

    10 4: 5 kcd/m 2: Typical photographic scene in full sunlight [7] [9] 8 kcd/m 2: Average clear sky [5] [12] 10 kcd/m 2: Clear sky at noon [4] [12] 10 kcd/m 2: White illuminated cloud [6] 12 kcd/m 2: Fluorescent lamp [5] [6] 10 5: 75 kcd/m 2: Low pressure sodium-vapor lamp [6] 130 kcd/m 2: Frosted incandescent light bulb [5] [6] [12] 10 6: Mcd/m ...

  7. Luminous flux - Wikipedia

    en.wikipedia.org/wiki/Luminous_flux

    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 intensity of 1 candela. If the optics were changed to concentrate the beam into 1/2 ...

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