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Old 10-17-2005, 12:38 PM   #1
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DIY Moonlight

Hey all,

I know some of you have made your own moonlights. How many Blue LED's did you use. I have a 37G regular tank, I believe the dims are 30x12x18.

I was going to use 6, 3 on each side. What do you all think?



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Old 10-17-2005, 05:00 PM   #2
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I havnt done a moonlight DIY project yet.. but after reading about them.. I would be inclined to use cold cathode instead of led. the pictures of the results look better IMO.
They use the blue cold cathode kits they sell for computer mods. HTH

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Old 10-17-2005, 05:21 PM   #3
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The cold cathodes would look better but the LEDs you can get are pretty close to the wavelength of the moon. It will provide a more natural setting for your friends. I just ordered one of ebay for $30 bucks including shipping. It should be here today sometime.

This is the same product I ordered. Except mine came with the power supply.

37 gal all glass
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green Bubble coral, hammer coral (8 heads!) ,various Zoos,green finger leather, green star polpys ,shrooms
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Old 10-17-2005, 05:34 PM   #4
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I got all the parts for mine from BG Micro...siliconed the LED's intot he wrap around canopy and it is quite nice..cheap too.
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Old 10-20-2005, 12:04 PM   #5
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I've always wondered where the whole, blue LED is the same wavelength as the moon thing came from. *Ignoring the fact that different blue LED's are on slightly different wavelenghts* Besides being passed around from mouth to mouth, I've never found anything that actually lends the argument any weight. Since the light from the moon is light reflected from the sun, then the sun's wavelength would also have to be blue.

But the true color of light from sun is white, the combination of all visible wavelengths of electromagnetic radiation. So the majority of the light from the sun would have to be blue, with all other colors in the minority. But from what I can find, sunlight is pretty evenly divided among red/blue/and green, with the other colors combined equalling about the same area as any one of the primaries, since they are just combinations of the primary 3. So the light from the moon should also be primary divided among red/blue/and green, and not just blue.

And blue is the most easily scattered by gas molecules in the atmosphere, giving us our pretty blue sky. And since the atmosphere is the same at night, the light from the moon should also lose much of its blue wavelength to it, leaving the light primarily red/green.

But the primary visible light at any given time is based on the angle of the light source to the atmosphere over whereever the observation is being done. FI when the sun is on the horizon, the light is passing through more of the atmosphere which scatters the longer wavelengths more, resulting in the sky's reddish/yellow color. The same holds with the moon. The only time the light from the moon looks white, is when it essentially directly overhead, allowing the light to pass straight through the atmosphere with limited deflection, otherwise it tends to shades of yellow.

Anway, as best as I can tell you should be able to use any color of LED and get to be just as close to moonlight as blue. Personally, I use blue because I like the color it gives the tank, but that's just my taste.
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Old 10-20-2005, 12:32 PM   #6
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Great responce Indy,

Ironically, before I read this I bought a small moonlight from my LFS. It was 1 3W white LED. It works perfect and looks really cool. It leave one side of my tank complete dark and casts a great ook on the other hhalf.

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diy, light, moonlight

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