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Old 20-04-2008, 10:16 PM   #1
BarraCuda™
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Arrow DIY LED lighting

It has been very long since I did any DIY projects. Now for my DIY Aquarium lighting experiment, some Luxeon V and CREE XR-E. They are meant to replace my 2x250W MH. Is it possible? I dont know yet, thats why I started this experiment.

I ordered 8pcs of the Luxeon V, 5W royal blues, 450nm. Each Luxeon V is actually 4 leds in one package, if you look closely you will be able to find 4 dies inside the lens



Modified array of 12pcs of CREE XR-E 1.25W 5000K

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Old 21-04-2008, 01:18 AM   #2
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Note that the Luxeon royal blue peaks at 450nm useful for photosynthesis but no glow for corals . Actinic peaks at 420nm, shorter wavelength for glow but not available for photosynthesis
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Old 21-04-2008, 01:19 AM   #3
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Spectrum chart for the CREE XR-E, 5000K was chosen because of the increased yellow/red spectrum needed for photosynthesis. However I tried keeping some purple acros under pure 15watts of CREE XR-E 5000K and failed, the acros bleached and recede slowly over 3 weeks.

I have now increased to 40watts of royal blue and 15watts of white, only 1 side of the tank is lit due to the costs of luxeons USD$23+ each!
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Old 22-04-2008, 11:32 PM   #4
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These 8 pieces of Luxeon V are driven by 2 of these tiny Luxdrive LED Drivers at 700mA

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Old 27-04-2008, 12:00 AM   #5
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The LEDs are connected to a 4'x1' 3mm aluminum sheet as a heat sink. Effectively, only half of the aluminum is heated. The other side is room temperature.

I have taken temperature readings directly on the heat sink above the LEDs, its around 43-47C, well below the thermal design requirements

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Old 05-05-2008, 10:28 PM   #6
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Received more Luxeon K2, still waiting for the CREE XR-E Q5s and 410nm actinic LEDs . These K2 will be driven at 1000mA or 1500mA once the 1500mA drivers are available.

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Old 12-05-2008, 10:35 PM   #7
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Hi,
Look cool, this DIY LED light. Good for adding moonlight to marine tank.
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Old 14-05-2008, 12:29 AM   #8
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Quote:
Originally Posted by Hansreef View Post
Hi,
Look cool, this DIY LED light. Good for adding moonlight to marine tank.
If you use these LEDs for moonlight then its way overpowered already. I'm able to keep some acros and clams under them!
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Old 14-05-2008, 11:05 AM   #9
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is the led complete? how much it cost total? and how much heat is produced compare to MH..
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Old 14-05-2008, 12:58 PM   #10
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Quote:
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is the led complete? how much it cost total? and how much heat is produced compare to MH..
Its only particially completed so I did not show any pics, cost wise also not confirmed as I'm still adding and modifying the arrays.

As for heat, there is almost no heat input from the LEDs. I once ran the LEDs with 1 tunze wavebox with no chiller for about 12hours when I shut the main pump down due to leaks. The water temperature raised from 25C to 26.8C when I came back at night, I'm actually once pleased that the wavebox operates relatively cool!
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