How much is too much moonlight?-pic - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 08-16-2012, 01:44 PM Thread Starter
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How much is too much moonlight?-pic

So I'm trying to get some cheap DIY moonlighting so I can still see what's going on after I shut down the main lights. I picked up a cheap 13" 14W T5 light at Walmart and tried it in my canopy. I think it looks awesome, very much like a full moon shining into clear shallow water. But my question is, is it too much? Will the fish stress out without more darkness? Will this light be enough to cause algae?

Here's a picture with the moonlight on:
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post #2 of 11 (permalink) Old 08-16-2012, 02:19 PM
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First off I don't recall anyone else asking this important question. Good for you.

If the camera has accurately capture the brightness as it appears to your eye then you have far too much light.

Look you know how bright moonlight is, but if you don't remember how bright it makes the landscape wait till the next full Moon and go find a dark place and look at the surroundings. That's how bright it should be in the tank.

Moonlighting threads
https://www.plantedtank.net/forums/sh...96#post1901496

https://www.plantedtank.net/forums/sh...05#post1827133
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post #3 of 11 (permalink) Old 08-16-2012, 03:04 PM
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I have a 90 gallon and all i have for a moonlight is a single 4w nightlight. Very sufficent.


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post #4 of 11 (permalink) Old 08-16-2012, 03:35 PM Thread Starter
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I guess I'll have to tone it down a little. Thanks for the help!
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post #5 of 11 (permalink) Old 08-16-2012, 03:38 PM
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dude, your moonlighting almost looks like regular lighting lol
I like how much area it covers, but maybe it would be better if you used a dark blue bulb or something so that it wasn't so bright.

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post #6 of 11 (permalink) Old 08-16-2012, 04:29 PM Thread Starter
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Quote:
Originally Posted by HybridHerp View Post
dude, your moonlighting almost looks like regular lighting lol
I like how much area it covers, but maybe it would be better if you used a dark blue bulb or something so that it wasn't so bright.
Lol... its nowhere close to as bright as my full hood

As far as blue lights, I think they are very unrealistic looking...
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post #7 of 11 (permalink) Old 08-16-2012, 04:36 PM
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Got a lux meter?
You can roughly get a PAR value from it. I'd think 10 PAR would be a good moonlight. Nothing grows at 20 PAR that I've noticed.


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post #8 of 11 (permalink) Old 08-16-2012, 04:46 PM Thread Starter
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Originally Posted by mistergreen View Post
Got a lux meter?
Unfortunately not. Any idea what kind of PAR would come out of a 14w t5? It's facing away from the water and bouncing off the canopy.

Last edited by jamesbaptista; 08-16-2012 at 04:46 PM. Reason: spelling
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post #9 of 11 (permalink) Old 08-16-2012, 05:03 PM
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Just get a nightlight and plug it into a small extension cord and then to a timer.


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post #10 of 11 (permalink) Old 08-16-2012, 05:18 PM
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Here's my rig with a moon light in it: DIY aluminum light hood ====> circadian rhythm

For a 46 bow front, I suggest about 2w of LED light. That seems about perfect. I can see what the kids are up to, but it's not overpowering. When that light shuts off, no one is spooked.





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post #11 of 11 (permalink) Old 08-17-2012, 12:32 AM
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I think you want to just add enough light to make water shimmer (i.e. one LED 15 lumen bulb)
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