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Old 07-20-2010, 05:18 PM   #1
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Lightbulb DIY Led 10 gallon build thread/alternative diy co2 thread

I think it's about time I finally started this. I'm probably going to be running 12ish 3w leds (3.7v ~800ma) for a total of ~3.6wpg and diy co2. Since I can't take my 29 or my 40B with me to school, I want to be able to continue my planted tank at school, and 10 gallons don't have very good lighting to start with.

I'm also considering finally starting my baking soda co2 system. When you heat baking soda, it releases co2, but it needs to be pretty hot. I'm wondering if could run copper pipes from the heatsink to a container with the baking soda, and use the heat from the leds to power my co2. If not, I can use a peltier (thermo electric cooling) where you run it at 12V, one side gets very hot, and the other gets very cool. Electricity isn't a problem, so the efficiency of the peltier shouldn't be an issue. One problem I see possibly is condensation, but we can worry about that later. I guess baking powder can come in a liquid activated form, where when you add a liquid, it will begin releasing co2. This could work very well for this application. Either add the liquid at the beginning, add a needle valve and some container that can keep up with the pressure.

I'll post a little more once I get my budget approved (parents) and find a suitable power source. If I make two strings of 6 leds, that'd be 1.6A and a little over 22V, which is reasonable. I'm hoping to be able to be close enough to the power supply voltage to be able to not have to have a resistor in the series, but any suggestions will be helpful

Thanks!
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Old 07-20-2010, 06:00 PM   #2
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Here are a few links to get everything started

LED Calculator - Current limiting resistor calculator for LED arrays

Diy : Led Array - UltimateReef.com

Another led project - Page 2 - UltimateReef.com

DIY LED Lighting Guide. Lots of Pictures! - Lighting - Aquatic Plant Central

DIY LEDs - The write-up - Reef Central Online Community

DIY LED Lighting via Luxeon Stars - DIY Aquarium Projects - Aquatic Plant Central

http://www.aquaticplantcentral.com/f...d-later-5.html

http://www.aquascapingworld.com/foru...-aquarium.html

This is also for my reference, so I don't have to look through all my bookmarks again :P
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Old 07-20-2010, 06:41 PM   #3
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I'm a little confused about lighting equivalencies. I've read from a few sites, that 1wled =4w normal as well as 12w=25w and 25=175w. Right now I'm leaning towards 4-6 normal watts per led watt, but can anybody confirm?

Aquarium Lighting; Kelvin, Nanometers, PAR, Bulb, Watt, MH, LED, Light Basics.

That site gave off a few of the numbers, and others came from random forum posts around the web.
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Old 07-20-2010, 06:42 PM   #4
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Nano-Reef dot com also has a large DIY LED community and guides. 12 3w at 800mA is going to be a lot of light for a 10 gallon. I'm planning on growing SPS with the same fixture over a 12g JBJ. You might want to invest in a dimming puck/driver to photo-acclimate.
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Old 07-20-2010, 06:45 PM   #5
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I just posted that just before you posted that :P

Anyways, I'm trying to find out. I'm wanting to be in the 3-5w range, but I'm having trouble finding consistent information. Now I'm thinking I may be able to cut that number in half, going with a safe estimate of 3-4 watts. That means with 6 leds, I'll have an equivalent of 54-72w...
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Old 07-20-2010, 06:47 PM   #6
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Good article, haven't seen that around. I'll have to sit down and give it a once over.
From what I have seen there is no good comparison to differentiate LEDs and the common lighting systems now. What really matters is the PAR values, and unfortunately the meters are hard to get your hands on so limited knowledge is available. I would look through examples on some sites, and look for where people have recorded PAR values and use that to judge. If i recall correctly, a tight grouping of 4 LEDs had something around 600 PAR at maybe 8" and 1000mA. I'll look.

EDIT: haha you did it again. Were you thinking all whites or what? I'm not exactly familiar with growth requirements of planted tanks.
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Old 07-20-2010, 06:52 PM   #7
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You need all whites for plants. And maybe 1-2 blues just for color enhancement. The newest spectrum that's all the buzz is 9325k bulbs. So I'm guessing 3x6500k 3x 10000k and 2x blue is sufficient.
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Old 07-20-2010, 06:56 PM   #8
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Ok i drastically overstated my last post. 300 PAR around 8" and 700mA.
NEW LED PENDANT FOR PICO - Nano-Reef.com Forums
Still though, plenty to grow plants.

If you use the methodology like in that RC build (like i did) and use independent power and pucks, you can only run them in strings of 6. (without getting into weird voltage power supplies) If you use something like a meanwell though, you can run larger strings, and is AC powered, so they are super easy to wire up.
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Old 07-20-2010, 07:09 PM   #9
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I was thinking of maybe using a notebook power supply, and burn off the extra voltage as heat?

I was planning on getting the cre xre p4 in the cool white color. (~6500k I think)


I suddenly got confused.. I was thinking that the leds would draw as much power as they needed (so I won't need to control amperage with my laptop power supply/charger, but how would I control what amperage I'm running at without something like a buckpuck? Could I even?
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Old 07-21-2010, 12:58 AM   #10
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Quote:
Originally Posted by krap101 View Post
I was thinking of maybe using a notebook power supply, and burn off the extra voltage as heat?

I was planning on getting the cre xre p4 in the cool white color. (~6500k I think)


I suddenly got confused.. I was thinking that the leds would draw as much power as they needed (so I won't need to control amperage with my laptop power supply/charger, but how would I control what amperage I'm running at without something like a buckpuck? Could I even?
You can limit current drawn from the laptop PSU with a resistor on the cheap. Or you can build a constant current driver. If you are not very good with circuits and schematics, I would suggest a resistor or a commerical driver.
Here is a little example of how you design a simple circuit:
6 leds that drop 3.4v when driven at 1A of current...
24v 6A SMPS

Each led will drop 3.4v. So that is about 22V total.

Ohms law: V = I*R
24V-22V/1A = 2ohms

So youll need a 2ohm resistor to limit the 6 led string at 1A. This neglects wire resistance and impedences.

Your resistor will dissipate some power.

P=I^2*R
1A^2*2ohms = 2W of power dissipation. So youll need a power resistor rated for more than 2W of power dissipation to limit the string current to 1A
So, why cant you use a buckpuk or meanwell?

Matt
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