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Old 10/15/2007, 07:50 PM   #1
Roland Jacques
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How much light loss from water surface reflection?

Just something i was wondering. not sure where to post this question. I figure a number of peops here would Know. How much light loss from water surface reflection. (assuming a normal surface overflow is used and no major oil film... )

I guess the second part of this question is. what effect would happen if you use a glass box to allow the light to bypass suface reflection?

Just thinking how LED lights... may be used like this because of the low heat... Something like a floating LED light fixture.


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Last edited by Roland Jacques; 10/15/2007 at 07:57 PM.
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Old 10/15/2007, 08:38 PM   #2
arts007
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Just an idea : My 250 watt 20k halides are 7 inches above the waterline and I get 36,000 lux and about an inch and a half below the water the reading drops to 20,000 lux, ... This is with a high surface agitation though, the clarity of the water is quite good. But as Im sure you know there are many factors that can vary from lighting and tank to tank, the bulb wattage, turbidity, surface agitation, distance of bulb.


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Current Tank Info: 120g SPS reef tank. 2x 400 watt Reeflux 12k on lumenbrights
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Old 10/15/2007, 09:08 PM   #3
Roland Jacques
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thanks, I'm just trying to get a average. Yours is about 40%. Have you every tested it when the water surface was still? does it go up or down with surface agitation.

I'm interested for a Prop system.

Just thinking you might be able to use 30% less light/energy... to get the same PAR.


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Old 10/16/2007, 12:05 PM   #4
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I will test it tonight when i get home... I'll turn off the pumps and take a reading...I have a 20k, 10k and an iwasaki 6500k and I'll test them all and see what kind of readings i get, kind of interested myself


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Old 10/16/2007, 08:26 PM   #5
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I tested the iwasaki 6500k and at the surface it was 58,000 lux and at 1½ inches it was 31,000 lux so just about the same.. and this was with all pumps off and got just about the same readings with the 20k with the pumps off as before this time it was 21,200 lux


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Old 10/17/2007, 12:06 PM   #6
Roland Jacques
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Thanks Arts007,


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