What does the "F" stand for?

Discussion in 'Lighting' started by HitchHiker, Apr 7, 2010.

  1. HitchHiker

    HitchHiker Valued Member Member

    I have been research fluorescent lighting and have a good understanding of the differences between the different "T"s (i.e. T12,T8,T6,T5), but what does the "F" refer to (i.e. F4 F12 F13 F14)?
  2. pepetj

    pepetj Well Known Member Member

    F stands for linear fluorescent, the numbers next to it represent the wattage of that lamp. F10 means linear fluorescent 10W; F24T5HO means linear fluorescent 24W 5/8" diameter lamp High Output

    Santo Domingo
  3. OP

    HitchHiker Valued Member Member

    Sweet so a F54T5HO would be your standard 48" 54 W T5HO?

    Would FC then mean a Compact Fluorescent?
    Last edited: Apr 7, 2010
  4. sirdarksol

    sirdarksol Fishlore Legend Member

    Yes to the first part of that question. That's what I'm working with for my aquarium.
  5. mathas

    mathas Well Known Member Member

    FC should stand for "fluorescent circline", which means the bulb is circular, but it wouldn't surprise me if some manufacturers didn't adhere to that.

    In  , the bulb code is FC12T5, meaning the tube itself is 5/8" in diameter, but it forms a torus with a 12" outer diameter. In  , however, the bulb code begins with FC30, and the 30 indicates that it's a 30W bulb. There doesn't seem to be a lot of consistency on what the number after the FC represents on circline bulbs, sometimes its outer diameter and sometimes its energy consumption.
    Last edited: Apr 7, 2010
  6. OP

    HitchHiker Valued Member Member

    Great thanks for the info, so basically a FC bulb is one that circular, but there is no standard as to what the number after the FC designation means. Great info thanks for all the help.

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