Looking for advice on LED bulb choices ...
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Old 04-18-2013, 02:17 PM   #1
thornomad
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Looking for advice on LED bulb choices ...


So - first planted tank. I want to do a buildmyled fixture (36"). Will do CO2. I like the buildmyled because its dimmable and customizable ...

I wanted to read some more about bulb choices and CRI. They have a planted tank default setup which has three types of lights: (10) 5700K, (3) 660nm, (2) 450nm (per 12"). The CRI is 77.

I've read some posts here where people experimented on bumping the CRI up very high ... I say experimented because I haven't found any actual customized planted tank build layouts. I can't find whether this actually helps plant growth and/or viewing pleasure.

I'm trying to find input on if I could/should customize this default setup further or just go with the what they offer.

Thanks,
Damon

Pre-configured: http://www.buildmyled.com/freshwater-planted-tank/
Customize: http://buildmyled.com/design-it-yourself/
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Old 04-18-2013, 04:33 PM   #2
zachseibel
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It is really hard to say if LED lighting will be better than any other light source, If the lights are the right spectrum then it will work for awhile. One thing to keep in mind LED lights spectrum fade quickly and before you know it they will not seem as bright as they did before and most likely less plant growth. There is a new LED light out on the market which is very expensive, Check it out and if you plan on building this look into spectrum more than anything. LED's will benefit energy cost but in the end most likely not as good of plant growth.
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Old 04-18-2013, 04:45 PM   #3
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Most people haven't had an issue with the LED's fading quickly, quite the opposite from what I understand. A higher CRI (color rendering index) will make colors appear more vibrant, as if they were being viewed under sunlight. 5700k will be a daylight spectrum, giving the plants most of what they need in terms of light requirements. The 660nm is in the red spectrum I believe, don't know about 450nm. A CRI of 77 is a bit low in terms of overall color rendering. In the world of high tech flashlights, I'd be looking for something like 90+ CRI for producing light that will render colors the best. You should be the one to try this if it's what your'e wanting and publish the results here!
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Old 04-18-2013, 04:45 PM   #4
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Zach, lumen maintenance on LED's is higher than any other light source, except for induction lamps.



In the lighting business, standards called "L70" and "L80" have been established to measure lamp life at lumen outputs of 70% and 80% of original output. LED's dominate these standards.
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Old 04-18-2013, 04:49 PM   #5
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Default Re: Looking for advice on LED bulb choices ...

Am definitely curious to try a bit of a mix ... But, being my first tank, don't really have anything to compare it with. Smile.

Was trying to find diy builds that used Cree lights and see what variation they had in bulbs. most I find only use one bulb type ... Maybe two.
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Old 04-18-2013, 05:03 PM   #6
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Be very careful with CRI ratings.

Higher is better...usually.

This is because we live our lives in air. CRI is measured in air.

We look at our aquariums through water, which filters out the various spectra at different rates. Red light, for instance is filtered out in a shorter distance than blue light.

So in theory, an aquarium lighting fixture could have a slightly lower CRI, due to increased red output, but once it is filtered by the water (both on the way to the plants, and then reflected out to our eyes) its "effective" CRI might be slightly higher than another fixture.

Just food for thought.
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Old 04-18-2013, 06:33 PM   #7
thornomad
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Default Re: Looking for advice on LED bulb choices ...

Quote:
Originally Posted by nofearengineer View Post
This is because we live our lives in air. CRI is measured in air.

We look at our aquariums through water, which filters out the various spectra at different rates. Red light, for instance is filtered out in a shorter distance than blue light.

So in theory, an aquarium lighting fixture could have a slightly lower CRI, due to increased red output, but once it is filtered by the water (both on the way to the plants, and then reflected out to our eyes) its "effective" CRI might be slightly higher than another fixture.

Just food for thought.
That's really interesting ... I did not know that. I have a 40B and it seems for the same length fixture I could afford a little less output at the expense of a higher CRI.
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Old 04-18-2013, 06:55 PM   #8
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Quote:
Originally Posted by thornomad View Post
That's really interesting ... I did not know that. I have a 40B and it seems for the same length fixture I could afford a little less output at the expense of a higher CRI.
I was actually trying to say the opposite.

I was suggesting you could afford a slightly lower CRI, as long as the reduction is only due to a slight boost in the red spectrum, which is good for us anyway, right?
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Old 04-18-2013, 07:17 PM   #9
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Quote:
Originally Posted by thornomad View Post
So - first planted tank. I want to do a buildmyled fixture (36"). Will do CO2. I like the buildmyled because its dimmable and customizable ...

I wanted to read some more about bulb choices and CRI. They have a planted tank default setup which has three types of lights: (10) 5700K, (3) 660nm, (2) 450nm (per 12"). The CRI is 77.

I've read some posts here where people experimented on bumping the CRI up very high ... I say experimented because I haven't found any actual customized planted tank build layouts. I can't find whether this actually helps plant growth and/or viewing pleasure.

I'm trying to find input on if I could/should customize this default setup further or just go with the what they offer.

Thanks,
Damon

Pre-configured: http://www.buildmyled.com/freshwater-planted-tank/
Customize: http://buildmyled.com/design-it-yourself/
Input these leds into the diy app. Also look through this thread http://www.plantedtank.net/forums/sh...d.php?t=198196
A CRI of 98. A noon K temp 5500-5900...
  • 5700K
  • 5000K
  • 6500K
  • 470nm Blue
  • 505nm Cyan
  • 505nm Cyan
  • 4500K
  • 3000K
  • 525nm Green
  • 525nm Green
  • 4000K
  • 5000K
  • 590nm Amber
  • 625nm Red
  • 590nm Amber

Last edited by Steve001; 04-22-2013 at 11:49 AM.. Reason: x
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