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Thread: 18" T5 HO bulbs

  1. #1

    Join Date
    Feb 2011
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    18" T5 HO bulbs

    I've been reading the last week on SM's build along with the entire FAQ. Needless to say, I'm sold.

    I do have a smallish sump area and was interested in building a variant of the SM-100 that is 18". The problem I'm having is that it is tough to find a good 18" T5 lamp with good color temp around the 2700K to 3500K range. The best found was 6500K.

    Anyone try this or have a good source for 18" T5 lamps?

  2. #2
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    Re: 18" T5 HO bulbs

    I tried a few weeks ago and could not find any.

  3. #3

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    Feb 2011
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    Re: 18" T5 HO bulbs

    In lieu of 3000K or 2700K bulbs, how effective would 6000K be for an 'SM-88' custom build? I just can't fit the SM-100 in my Elos70 stand area.

  4. #4
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    Re: 18" T5 HO bulbs

    A bit less. And also of note is that the last 2 inches of T5 bulbs don't put out any light. So a 24 inch bulb only has 20 inches of light; An 18 inches bulb only has 14 inches of light. So T5's become less efficient as they get shorter.

  5. #5

    Join Date
    Dec 2010
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    Re: 18" T5 HO bulbs

    Quote Originally Posted by SantaMonica
    A bit less. And also of note is that the last 2 inches of T5 bulbs don't put out any light. So a 24 inch bulb only has 20 inches of light; An 18 inches bulb only has 14 inches of light. So T5's become less efficient as they get shorter.
    so then if you want the best effect on an 18" scrubber buy 2-24" fixtures and have them hangover 3" on each side?

  6. #6
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    Re: 18" T5 HO bulbs

    2"

    And this will also give you more room to work on the sockets when needed.

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