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Old 09-25-2011, 11:30 AM
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Default LED wattage to Gallon ratio ?

I have a 40 gallon, its 16 inch deep.

is there a wattage to gallon to depth ratio or rule of thumb ?

This is the light I ordered , is 72 watt

CREE XM-L - PAR38 - Affordable LED Aquarium Lighting - Fish Tank LED Pendants

Has anyone used this light before ?

I assume almost 2 watts per gallon should be enough ??

Thanks
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Old 09-25-2011, 11:36 AM   #2
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Watts per gallon is irrelevant, especially with LEDs.
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Old 09-25-2011, 11:53 AM   #3
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You should be plenty fine with that fixture
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Old 09-25-2011, 02:00 PM   #4
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Quote:
Originally Posted by thepanfish View Post
Watts per gallon is irrelevant, especially with LEDs.
then when we are choosing LEDs to set up, what are we suppose to look for if not wattage? The name brand?
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Old 09-25-2011, 02:22 PM   #5
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You look at PAR, more or less it's all about the PAR values at any given depth that will tell you what can or can not be kept in a tank under certain lighting.
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Old 09-25-2011, 02:58 PM   #6
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I have a 29g Biocube that has a depth around 15"

What do you think of the 3watt Luxeon LEDs? How many RB and CW's do you think I would need to grow clams and SPS?
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Old 09-26-2011, 08:20 AM   #7
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Quote:
Originally Posted by Ashevillian View Post
then when we are choosing LEDs to set up, what are we suppose to look for if not wattage? The name brand?
multiply your tank's lenght x width, you'll get the surafe area, divide the surface area by;
10 if you want to burn your corals bright
15 if you want SPS (most people use)
20 for LPS/softies
----------------
after you divide the surface area, that's the number of LED's youd want.


you cant go with watts/gal with LED's.
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Old 09-26-2011, 08:29 AM   #8
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Quote:
Originally Posted by cain View Post
multiply your tank's lenght x width, you'll get the surafe area, divide the surface area by;
10 if you want to burn your corals bright
15 if you want SPS (most people use)
20 for LPS/softies
----------------
after you divide the surface area, that's the number of LED's youd want.


you cant go with watts/gal with LED's.
Thats not a very good way to do it either. optics and brand of led will change that very quickly.
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Old 09-26-2011, 08:37 AM   #9
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Quote:
Originally Posted by DBOSHIBBY View Post
Thats not a very good way to do it either. optics and brand of led will change that very quickly.
As well as depth of tank.
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Old 09-26-2011, 08:40 AM   #10
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Quote:
Originally Posted by mikejrice View Post
As well as depth of tank.
+1
i have 5 par38s over my 65g so that would be 25 leds. so according to that math i would be below the lps amount of leds. yet i have sps and a clam on the sandbed.
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