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  1. #1
    Supporting Member malira's Avatar
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    12w or 16w grow light enough?

    Like the title says would this grow light be enough to grow macroalgae?
    Has reds and blues.

    16w
    https://www.amazon.com/gp/aw/d/B00W6...7L&ref=plSrch#

    12w

    https://www.amazon.com/gp/aw/d/B016C...JL&ref=plSrch#

    12w


    16w


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  2. #2
    MARSH GUEST
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    I wouldn't be too sure but amazon let's you return it within 30day so why not


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  3. #3
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    I bought a very similar one to try, but haven't gotten it setup yet. I'll put it under the PAR meter tonight though.

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  5. #4
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    I don't know if this helps or not but I have a 12 watt light over my clam and it grows it!

  6. #5
    Supporting Member Clownfish Chris's Avatar
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    I wonder how they came up with 16wt. Most sellers seem to simply add up the number of LEDs and multiply by the wattage of an individual LED. Is this an actual honest seller or am I thinking of this wrong?

    For all intents and purposes it will depend on the PAR as you probably know. I have a 23wt par 38 bulb that puts off less than 100 par only one foot away.

    I am interested to hear Dragon's results.

    Lumin, How long has that clam been under that light? I suspect it may be okay now but is probably not enough long term.

  7. #6
    Supporting Member malira's Avatar
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    Quote Originally Posted by Clownfish Chris View Post
    I wonder how they came up with 16wt. Most sellers seem to simply add up the number of LEDs and multiply by the wattage of an individual LED. Is this an actual honest seller or am I thinking of this wrong?

    For all intents and purposes it will depend on the PAR as you probably know. I have a 23wt par 38 bulb that puts off less than 100 par only one foot away.

    I am interested to hear Dragon's results.

    Lumin, How long has that clam been under that light? I suspect it may be okay now but is probably not enough long term.
    I thought that too about watts.
    I know someone who has it.

    I have a 55g sump. With about 40 gallon in it. It has about 17 inches of water.

    Am I looking for more watts to penetrate the water?

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  8. #7
    Supporting Member Clownfish Chris's Avatar
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    Watts is how much electricity is used to power the device. Par is how much light you have. Yes more watts means more power which means more PAR but there are other variables as well. The efficiency of the diode, the optics, color temperature, etc.

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  10. #8
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    Been looking into a new fuge light as well. What is the preferred light spectrum? 5000k- 6500k? Like a white floor light or are these red/blue LEDs better.

    I read somewhere the micro algae flourishes under red/blue....

    What does the Macro algae like?

  11. #9
    Supporting Member malira's Avatar
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    Quote Originally Posted by Stickboy97 View Post
    Been looking into a new fuge light as well. What is the preferred light spectrum? 5000k- 6500k? Like a white floor light or are these red/blue LEDs better.

    I read somewhere the micro algae flourishes under red/blue....

    What does the Macro algae like?
    BRS did a video comparing lights.

    Plants prefer blue and red.

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  12. #10
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    Chris I've had that clam for 10 months now. It has been under 3 different light the 12 watt and I under a 16 watt and also a 11 watt and it's probably grown most likely about half an inch.


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