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Old 01-04-2004, 03:50 AM   #1
Bronx19
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Hey guys. My current tank is 18 inches high, would cutting 4 inches off it benefit me in a planted tank? I have 2.5 watts a gallon currently. Would getting rid of some height make things easier?
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Old 01-04-2004, 03:58 AM   #2
Rex Grigg
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Not really.
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Old 01-04-2004, 04:12 AM   #3
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lol, thanks for shooting down my dreams..

Well what happened was, I wanted a new 30 Gallon (18 high) but it would have taken 5 weeks and cost twice as much.

So the only other avaialble one was the 14". I just thought it might benefit plants in regards to lighting.
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Old 01-04-2004, 04:21 AM   #4
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wow..I think for the first time I dissagree with rex.

a point light source falls off as the square of the distance.

ie. the light at 20" is 1/4 as bright as the light 10" away is 1/16 as bright as the light 5" away. There are some approximations here in terms of sphericalprojections, but this isn't a big error unless you are real close to the souce

If the distance from the light to the area you want to light is currently 18" away, then if you change that to 14", the area right below the light will be ~1.7x brighter. This is best case scenario assuming point source optics, but evenworst case, it should be atleast 1x brighter in terms of watts/cm^2.

...unless I made a mistake inmy math


..but I guess I don't really dissagree with rex....cause this doesn't make it easier..just means more light *L*..and we all know that more light is harder to work with
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Old 01-04-2004, 04:32 AM   #5
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Very nice info, thanks for sharing.

I hope it aint 1.7 though. That'll have me over 4. I can always take out one bulb though.
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Old 01-04-2004, 04:57 AM   #6
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Wow... for the first time I agree with Rex. Just kidding!!!

For two reasons.

The square of the distance light reduction DOES NOT apply to fluorescent bulbs. If a plant is under the center of the bulb, farther distance is offset by the additional bulb length that shines on that plant. Assuming that the light from the same fixture 14" away is 1.7x brighter than 18" away is not correct.

Second, I still believe that a bigger, larger, even taller tank offers more aquascaping options than a shallower, smaller tank. To me, the additional 4 inches provide more growing area (most plants we use need to be cut back all the time anyway) AND provide a higher visual impact.

Don't get me wrong... if I had to choose between a tall and a deep tank I would prefer the deep one... better for aquascaping... but with the same diameter, I would rather go with the taller version.
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Old 01-04-2004, 05:15 AM   #7
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hmmm...I guess I should bust out mathematica and solve the integrals for the real light advantage from a non point souce :-D
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Old 01-04-2004, 12:23 PM   #8
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Quote:
Originally Posted by Bronx19
lol, thanks for shooting down my dreams..

Well what happened was, I wanted a new 30 Gallon (18 high) but it would have taken 5 weeks and cost twice as much.

So the only other avaialble one was the 14". I just thought it might benefit plants in regards to lighting.
If you are talking about the Oceanic 30 gallon cube I'd say go for it but get a 96 watt quad PC fixture to light it.
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Old 01-04-2004, 12:32 PM   #9
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Fluorescent lights are not point light sources. And for the small differences in depth we are talking about 4" there is no practical difference in light intensity.
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