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Old 02-07-2009, 11:27 AM   #21 (permalink)
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Default Re: What's the skinny on LED lighting?

OMG! Be still my nerdy heart!
I noticed you have an array of hard drive cooling fans on both sides. What's the noise like?
Those Luxeon LEDs get pretty hot, looks like you mounted them directly on some heat sinks, right? How 'bout using heatpipes or watercooling you can keep the tank warm at the same time .

Seriously, impressive Supercoley! Hats off!

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Old 02-07-2009, 01:47 PM   #22 (permalink)
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Default Re: What's the skinny on LED lighting?

The board is 6mm acrylic. Then each LED has a memory chip (quite small) heatsink on the rear of the star and this is then mounted to a cut up old reflector which doesn't act as a reflector but stops a little glare and acts as extra heatsinking. then the whole board is fixed into the 'luminaire'

Yes they get hot hence 4 fans blowing in at one end and 4 sucking out at the other plus the heatsinking.

The fans are silent as all 8 are being powered by a single 10V supply so are not running overly fast

A couple more pics

This is a single LED in the main unit:


A look from the end:


The Nano one uses lenses, collimators (not a very good spread as you can see in the previous post. Much better sread without them) and proper heatsinking!

The Nano unit from above:


A single LED:


A lense/collimator fitted to an LED:


Have a good night's sleep

AC
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Old 02-07-2009, 02:13 PM   #23 (permalink)
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Default Re: What's the skinny on LED lighting?

Supercoley1,
You have a very cool setup there. Where do you get this stuff and how much did you have to spend? Is it economical if you DIY?

Like everyone has said LED's are going to be the wave of the future. NASA has funded a ton work with LED's for growing plants in space. A lot of the technology has come from that. They have LED panels that can emit single light wavelengths at a time to supply the plant with only what it needs. It looks pretty messed up to see a plant growing under red and blue light so that won't work for aquariums, but its pretty interesting stuff. Of course ee would need the full spectrum so it looks pretty to look at.
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Old 02-07-2009, 04:06 PM   #24 (permalink)
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Default Re: What's the skinny on LED lighting?

I found this site that sells the Luxeon and Cree LEDs http://www.ledsupply.com/
The Luxeon K2 @ $9 each can pump out a blinding 6500K, 250 lumens with 1.5 mW! But it does get hot 150C so heat disspation is key.

Here's another one is a light strip format but its getting pricey http://www.ledsupply.com/06007.php

And for the Wall Street CEOs, ones for aquariums http://www.ledsupply.com/solaris.php.

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Old 02-07-2009, 06:04 PM   #25 (permalink)
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Default Re: What's the skinny on LED lighting?

Quote:
Originally Posted by Bunbuku View Post
And for the Wall Street CEOs, ones for aquariums http://www.ledsupply.com/solaris.php.
You sure they could afford it? They only make a half million now...
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Old 02-07-2009, 06:07 PM   #26 (permalink)
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Default Re: What's the skinny on LED lighting?

Quote:
Originally Posted by Bunbuku View Post
I found this site that sells the Luxeon and Cree LEDs http://www.ledsupply.com/
The Luxeon K2 @ $9 each can pump out a blinding 6500K, 250 lumens with 1.5 mW! But it does get hot 150C so heat disspation is key.

Here's another one is a light strip format but its getting pricey http://www.ledsupply.com/06007.php

And for the Wall Street CEOs, ones for aquariums http://www.ledsupply.com/solaris.php.
How do you know what the right amount of light is for a given tank?
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Old 02-07-2009, 06:36 PM   #27 (permalink)
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Default Re: What's the skinny on LED lighting?

I am guessing that you havent seen what is going on in the LED patent lawsuit which threatens to prevent anyone from making LED fixtures for resale without massive royalties to Orbitec. Full details can be found in this blog post.
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Old 02-07-2009, 06:56 PM   #28 (permalink)
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Default Re: What's the skinny on LED lighting?

Quote:
Originally Posted by helgymatt View Post
How do you know what the right amount of light is for a given tank?

Not sure, maybe Hoppy knows if he still lurks around in APC. The other thing to consider is that the spectral output is different.

Here is the Luxeon K2 on page 14 http://www.ledsupply.com/docs/k2_tffc.pdf
Here is the ADA 8000K MH http://www.adgshop.com/ProductDetail...Show=TechSpecs
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Old 02-08-2009, 12:40 AM   #29 (permalink)
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Default Re: What's the skinny on LED lighting?

This LED unit is run (underpowered) at 42W and is visibly brighter than 48W T5HO!!

The plants are growing faster even though the LEDs are 13" above the water surface where the T5s were about 5 "

Cost about 110 to build (electric stuff)

The LEDs can be found on ebay here:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...#ht_1964wt_907

Don't forget current controllers for these babie or they won't last long 'regulated' power supplies won't cut the mustard when LEDs are involved because there is a very very fine line between underpowering and frying them!!! Current controllers are a must.

AC
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Old 02-08-2009, 12:44 AM   #30 (permalink)
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Default Re: What's the skinny on LED lighting?

This LED unit is run (underpowered) at 42W and is visibly brighter than 48W T5HO!!

The plants are growing faster even though the LEDs are 13" above the water surface where the T5s were about 5 "

Cost about 110 to build (electric stuff)

The LEDs can be found on ebay here:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...#ht_1964wt_907

Don't forget current controllers for these babie or they won't last long 'regulated' power supplies won't cut the mustard when LEDs are involved because there is a very very fine line between underpowering and frying them!!! Current controllers are a must.

AC

Before anyone asks me more questions. lol Here is the thread (on another forum) that ran alongside the build so I was getting advice all the way through it on what to do and what to use (I have never soldered before this project ). Very useful and includes links to virtually all parts involved :

http://www.fishforums.net/index.php?showtopic=264895

AC
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