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Old 01-16-2015, 01:20 AM   #1 (permalink)
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Default Glass Lens

Hello,
I had a glass company make up a lens for my hood. Now I wonder if the glass is interfering with the properties of my lights. The glass is 3/16 thick. The lights are the "AquaGro" GroBeam 1500 Ultima Leds.
The reason for the lens is to give the leds more protection from moisture buildup in the hood. My leds were failing and when I contacted the distributor, he said they were getting a number of complaints and the solution was to install cross ventilation. So I made the changes by making openings on both ends of the hood, installed a grille on each and then installed a fan in the top of the hood. Now with the lens installed, air in drawn in on both ends and exits in the middle of the hood.

Now the reason I suspect interference, is that gpa and bsa is taking over my plants and I suspect a lighting issue. Your thoughts?
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Old 01-16-2015, 02:12 AM   #2 (permalink)
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Default Re: Glass Lens

Less light generally does not lead to algae. You lost a small percentage with the glass. Do you add feet or co2. How long has tank been up etc.
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Old 01-16-2015, 09:10 AM   #3 (permalink)
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Default Re: Glass Lens

I was thinking along the lines of both light and spectrum. My led's have their own lens. When I added an additional glass lens to the hood, I am guessing I increased the light penetration a bit but I suspect it has more impact on the spectrum. The manufacturer does not supply hoods for their led's. But they do supply parts to suspend the led's over the aquarium.
I have 5 plants in my 75 gallon tank (68 gallon actual volume). I been feeding them up to 15 ppm nitrates, 2 ppm phosphates and about 10 ppm potassium and add traces. I do water changes every two weeks. The plants do not take in much ferts because after a 75% gallon water change, I test my water and I get 10 ppm nitrates and 1 ppm phosphates using professional test kits.
My tank has been set up for 3 years and I dose CO2.
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Old 01-16-2015, 10:16 AM   #4 (permalink)
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Default Re: Glass Lens

Visible light and 'spectrum' are the same thing - Spectrum of light - measured in nanometers of wavelength.

If the glass is borosilicate glass it has a lot of iron in it and could possibly absorb some light at a specific spectrum. The glass may also shift the light rays at a different angle, and then the water defracts it again. The tank water is probably absorbing more light than the glass.
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Old 01-16-2015, 12:40 PM   #5 (permalink)
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Default Re: Glass Lens

Thanks, I'll do more checking to see if I can determine what has cause this acceleration of bsa and gsa.
It just might be potassium overdose.
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