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Discussion Starter · #1 ·
So some of you may have seen my earlier thread about looking for a light for my low tech tank. I've come down to two lights.

Marineland double bright 18"-24" fixture
Finnex fugeray 20" fixture.

My questions are
1) will 45 par at the substrate be too much for low-medium light plants? (Finnex)
2) has anyone used marineland double bright for a planted tank?
 

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No not for low/med light plants it's not too high but still may give algae issues if
there aren't lots of plants and a few fast growing ones. What tank do you have ?
There was someone on here whio claims to have grown some med light plants under a Marineland DB, but others say they are mostly good for fish/viewing only.
I have one and tried it on a ten g tank(the 20" model) and had that AND one T8 bulb
on it and no plant growth...but the tank wasn't healthy at the time and I didn't realize that while I had the MDB on it so it's on the shelf in the closet.
I personally didn't like the way the beams shown their light absolutely straight down.
I guess I'm just a bulb man...T5/T8..too many shadows/w the LED's.
Probable wouldn't be that way in any tank over 12" deep as the light can spread then.
 

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For lower light tanks, ones without the higher demands for nutrients, it really is all down to the light for algae control. Control the light, control the algae. You should do okay with low light plants with the Marineland fixture, but I have no experience with it.
 

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Discussion Starter · #7 ·
I've decided to go with the Finnex fugeray, but now I can't decide if I should buy the 16" or 20" fixture. I would like the 16" fixture because the light isn't too strong, but it would not tech across my 10g tank. The 20" would, however I'm afraid the light it would give if would be too much for a low to medium plant tank. Can anyone help by
1) giving a way where I could get the 16" fixture to fit
2) giving proof that the 20" fixture won't be overkill.
Also gets a link to the par chart
http://www.plantedtank.net/forums/showthread.php?t=189944
 

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Discussion Starter · #17 ·
R you sure, because the intensity of the light seems so strong. I just don't want the light to be too strong. After looking at that par chart, almost half my tank would be under high light conditions. Sorry I'm just asking a lot of questions because I'm new to planted tanks.
 

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R you sure, because the intensity of the light seems so strong. I just don't want the light to be too strong. After looking at that par chart, almost half my tank would be under high light conditions. Sorry I'm just asking a lot of questions because I'm new to planted tanks.
Yeah IMO. It's a lot cheaper to raise the light up if needed, than it is to buy another light or the hassle of returning/exchanging, if the 16" isn't doing a good enough job for your plants. What I've done before is call the manufacture of the lights (Finnex) and discuss your needs/concerns and ask them if they think that light will work best for your setup. :fish:
 

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Discussion Starter · #19 ·
Yeah IMO. It's a lot cheaper to raise the light up if needed, than it is to buy another light or the hassle of returning/exchanging, if the 16" isn't doing a good enough job for your plants. What I've done before is call the manufacture of the lights (Finnex) and discuss your needs/concerns and ask them if they think that light will work best for your setup. :fish:
Hire would I raise it, other than using risers?
 
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