T5 listing question

Discussion in 'DIY, Equipment & Water Chemistry' started by Soundline, Jul 31, 2017.

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  1. Soundline
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    Soundline Member

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    I have some t5 ho 24w lights with 6400k bulbs. Now I got them for growing orchids, and can take remember a damn thing about lighting for saltwater, and I've never done freshwater plants.

    Just wondering if they would work?
     
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  3. Seattle_Aquarist
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    Seattle_Aquarist Well-Known Member

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    Hi Soundline,

    Your 24 watt 6400K T5HO bulbs will work for freshwater, however remember that T5HO lamps decrease in output substantially after they have been in use for a year.
     
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  4. Soundline
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    Thanks it was only used for about 3 months if that. Do you by chance know what it is exactly that decreases?
     
  5. Seattle_Aquarist
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    Seattle_Aquarist Well-Known Member

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    Hi Soundline,

    Typically the light intensity (PAR) decreases. I use power compact lamps (basically a T5HO bent into a "U" shape) on a couple of my tanks and the PAR has dropped from PAR@105 when new to PAR@65 after 12 months. There is some thought that there may be a shift in the spectrum (K) but I don't know if it does or not.

    GSAS has a Apogee PAR Meter (Model 510) available to members so we can quantify the light intensity in our tanks.
     

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