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Old 04-30-2009, 11:27 PM   #1
Craigthor
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Thinking about LED's


With all this LED talk I'm considering converting my ADA Mini Solar over to LEDs possibly.

A few questions though.

1- I won't be able to use cooling fans with this so it would be sole heat tranfer.

2- I've only got about a 2.5"x 5.25" area to hid the buck pucks or drivers will that be enough space? Again no cooling fans in this spot.

3- The closest to the ends I could get is about 1.5" all teh way around due to the design of this light fixture. Unless I can find someone to design me a hanging fixture like this: http://www.aquaticplantcentral.com/f...ng-system.html

4- How Many LED's considering 3W for the High Light properties.

5- Only have 1.75" in the middle for the high sides and slopes down on each side.

Ideas? Suggestions?

I will post pics just need to finihs cleaning up my Photobucket stuff.

Craig
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Old 05-01-2009, 12:02 AM   #2
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Old 05-03-2009, 06:49 PM   #3
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Any thoughts on the heat issue for those that have built one? I'm also considering hte powerbright modules as they are run via a transformer and I think I could disassemble them to mount them in the fixture. I've heard they run cool to the touch.

I would run 3 of them for a total of 12 watts of 10K lighting. Prototyp3 has shown good results with his 2 over a 2.5g tank. Don't think I can fit 4 of them in this fixture.

Wish I had one to play with though as they are expensive to find out that it won't work.

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Old 05-03-2009, 07:30 PM   #4
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As soon as I get my LED fixture up and running I hope to be able to figure out how many of that type of LED gives what light intensity in PAR. But, that is probably more than a week away. For now I could only guess.
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Old 05-03-2009, 07:37 PM   #5
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Here is some great information about leds
http://www.nano-reef.com/forums/inde...owtopic=186982
hopefully you don't have to register to view it.
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Old 05-03-2009, 10:19 PM   #6
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Here is some great information about leds
http://www.nano-reef.com/forums/inde...owtopic=186982
hopefully you don't have to register to view it.
That is where I started to get interested in LEDs. As I did more research to answer my questions it only got more interesting, but for awhile much harder to understand. We, and especially me, owe evilc66 a big thank you for writing this.
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Old 05-03-2009, 11:41 PM   #7
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Thanks and yes I read through that some time ago...

Craig
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Old 05-06-2009, 02:11 PM   #8
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No thanks needed, but appreciated. I'm all for getting LEDs into the hands of the hobbyist.

Craigthor, looks like I already started answering some of your questions on NR.

The fixture seems to be a nice size, and with some careful planning, it could be made into a pretty sweet little LED fixture.

For a tank as small as yours, I think you can get away with 6 LEDs. You are going to have a hard time finding any high power LEDs with a color temp higher than 6500K. There are some, but they are few and far between. Kai Domain and Deal Extreme have Cree R2 WC bin LEDs, which will be around 7000K, but thats as high as you will be able to get cheaply. Cutter has Q3 WA bins, which is as close to 10K as you are going to get. I don't know if you are going to want something that blue anyway. It will really wash out the reds.
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Old 05-06-2009, 09:50 PM   #9
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Quote:
Originally Posted by evilc66 View Post
No thanks needed, but appreciated. I'm all for getting LEDs into the hands of the hobbyist.

Craigthor, looks like I already started answering some of your questions on NR.

The fixture seems to be a nice size, and with some careful planning, it could be made into a pretty sweet little LED fixture.

For a tank as small as yours, I think you can get away with 6 LEDs. You are going to have a hard time finding any high power LEDs with a color temp higher than 6500K. There are some, but they are few and far between. Kai Domain and Deal Extreme have Cree R2 WC bin LEDs, which will be around 7000K, but thats as high as you will be able to get cheaply. Cutter has Q3 WA bins, which is as close to 10K as you are going to get. I don't know if you are going to want something that blue anyway. It will really wash out the reds.
I had no idea that you were on here. Do you have any planted tanks?
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Old 05-07-2009, 03:02 AM   #10
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45g pentagon corner tank, high light with DIY CO2. I'm everywhere
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Old 05-07-2009, 03:13 AM   #11
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Ok... I was thinking the same thing Craig, I'm getting closer and closer to starting a light fixture myself...

And with evilc66 description it would even be hard to mess up
Great article!

But first I have 1 or 2 other DIY projects that I need to finish up
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Old 05-07-2009, 03:20 AM   #12
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Actually, Craig, why can't you use cooling fans?
I would look into these tiny micro-processor fans. You may be able to fit one into the end of your light fixture with the appropriate openings (slots, holes, etc) on the opposite side you could get a good flow going across the heat sink. This is just conceptual, and the actual sizes may not allow this concept to work, but I would check into that.
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Old 05-07-2009, 11:11 AM   #13
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Quote:
Originally Posted by Regloh View Post
Actually, Craig, why can't you use cooling fans?
I would look into these tiny micro-processor fans. You may be able to fit one into the end of your light fixture with the appropriate openings (slots, holes, etc) on the opposite side you could get a good flow going across the heat sink. This is just conceptual, and the actual sizes may not allow this concept to work, but I would check into that.
I would prefer not to drill this fixture. looks like I may have no choice but to do so though.

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Old 05-07-2009, 11:43 AM   #14
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Oh, wait... maybe you could just mount the fan to the heatsink itself and vent through the bottom (water side)on the side closest to the mounting arm. You could then drill the other vent holes or slots on the bottom on the side away from the arm. You would be blowing towards the water surface, but it looks like you have a decent distance between the fixture and the water...

This should allow you to build the LED fixture as a packaged system outside and then mount it in. You may also be able to mount this package in with some thermal paste and try to use the housing itself as part of the heat sink. Problem here would probably be the potential of dripping pretty nasty stuff into the aquarium.

EDIT: The housing of the fixture is metal, right?
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Old 05-07-2009, 12:55 PM   #15
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You probably *need* to at least open it up a bit. You might get away with not using a fan, but the heat from the LEDs is pretty muched closed in there if you don't put any openings on there.
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