Finnex Ray II Ultra Slim LED DS - Dual 7000k 24 inch
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Old 03-21-2013, 03:05 PM   #1
Stitcher
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Finnex Ray II Ultra Slim LED DS - Dual 7000k 24 inch


What kind of lighting would the Finnex Ray II Ultra Slim LED DS - Dual 7000k provide on a 20H tank?

I don't understand these LED lights and PAR.

Would this be low, medium, med-high, or high?

Thanks
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Old 03-22-2013, 01:06 AM   #2
sdaugherty
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The first step is to figure out how far the light will be from the top of your substrate. 20 H is like 23" high I think and you'll want 3" of substrate so 20".

Next you go to this thread:

http://www.plantedtank.net/forums/sh...d.php?t=184368

And look at the charts..you're looking for PAR vs Distance for LED's..

You'll see the Finnex Ray II 24" listed.. at 20" it says about 50 PAR.

Compare to:
Low light - 15-30 micromols of PAR - CO2 is not needed, but is helpful to the plants
Medium light - 35-50 micromols of PAR - CO2 may be needed to avoid too many nuisance algae problems
High light - more than 50 micromols of PAR - pressurized CO2 is essential to avoid major algae problems

Hope this helps.
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Old 03-22-2013, 04:25 AM   #3
latchdan
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^I told him/her this in another thread

20H is 16 3/4 inch, a 20 extra high is 23 3/4. (from the charts I'm looking at). I'm not aware which one he/she has.

Last edited by latchdan; 03-22-2013 at 04:30 AM.. Reason: tank hights
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Old 04-18-2013, 02:00 PM   #4
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Thanks. I think I understand it now.
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