LED build 240 gallon - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 02-09-2013, 10:17 PM Thread Starter
Algae Grower
 
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LED build 240 gallon

I've been reading up on all the great LED builds on this forum and want to give it a shot. My experience with electronics, other than tinkering with computer hardware, is minimal. Here we go:

Aquarium 72Lx30Wx25H



Fixture (3) 18 inch Makers Led Kits
Top view

Bottom view


Cluster composition (2 per fixture, 6 total):
3 cree xml cool white
3 cree xml warm white
2 exotic ocean coral white
1 blue led for moonlight in the middle of each fixture

Project Goals:
1. Ability to produce right to left sunrise/sunset.
2. Ability to produce right to left moonrise/moonset.
3. Ability to dim cool white, warm white, and blue moonlight on each heatsink independently. (Ocean coral whites can be wired to the same driver as independent fixture dimming is not as crucial.)
4. Power supplies, drivers, and controllers must be placed inside of aquarium stand to reduce the hanging weight of the fixture.
5. Produce enough light to grow most aquatic plant species.
6. Produce an attractive color and “shimmer effect”.

Questions/Concerns:

1. Will this configuration produce enough PAR to grow plants and provide an even spread of light?
2. What height above the substrate should the fixture be placed?
3. What optics to use, 40 or 60 degrees?
4. What driver(s) to use?

Your comments, advice, and suggestions are appreciated.
Thanks!
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post #2 of 5 (permalink) Old 02-09-2013, 10:44 PM
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It is very unlikely that this will give you uniform lighting over the whole length of the tank. It would be more likely to work well if the heatsinks were parallel to the length of the tank. Here is one method for estimating how many of what LEDs it takes to achieve the PAR that you want, at the distance from the substrate you want the light to be: https://www.plantedtank.net/forums/sh...999&highlight=

Hoppy
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post #3 of 5 (permalink) Old 02-10-2013, 12:28 AM
Algae Grower
 
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I'm planning a LED build for my 200.

Similar size to your tank. I'll be watching!

I've got a spreadsheet I've been using to model intensity and spectra for design. My calculations show that the your lighting should be good (maximum PAR approx 80 with Hoppy's spreadsheet if I've done it correctly - you might want to be able to dim your lights), but I agree with Hoppy - it won't cover the tank evenly. I'd put it in three - six clusters along the length of the tank rather than six along the edges.

Optics depend upon how high above the tank you want to be. I'll be using 60 degree optics with the lights about 15 inches above (about as far us as I can get). If I could I'd go further up and tighten up the optics, that way you get less of a difference in light intensity from the top of the tank to the bottom.

So now the experts can chime in and let me know if my advice is correct!
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post #4 of 5 (permalink) Old 02-10-2013, 01:21 AM Thread Starter
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Thanks Hoppy, it makes sense to place it parallel. The majority of plants will be toward the center of the aquarium. No need to shine intense light on a sand border. Here is a revised rough sketch:


The heatsinks will be 6 inches from the the aquarium edge and 3 inches apart.
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post #5 of 5 (permalink) Old 02-10-2013, 02:12 AM
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My spreadsheet doesn't work with clusters like that, only uniformly spaced rows. So, I have no idea how much PAR you would get with this.

Hoppy
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