Using Screening To Filter Light
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Old 11-02-2012, 05:30 AM   #1
Django
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Using Screening To Filter Light


I'd like to use screening material to filter the light as an interim point between a pair of 10w Compact Fluorescent Lights and a pair of 13w CFLs instead of raising the lights, which in my situation (apartment) would be very difficult.

If anyone knows how to calculate the difference in percentage output of the 10w and the 13w that would help a lot too. My real question is if anyone knows how much screening reduces light. I suppose I could just try it but I don't want the rest of the roll kicking around my apartment if I don't really need a 20" x 11" (10 gallon) piece of it. What do you think?
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Old 11-02-2012, 06:03 AM   #2
beedee
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i used it on my t5ho i had over my 11.4g mr. aqua, i was just using the standard legs that came with my aquaticlife fixture.

2x 18w bulbs
1, 10000k
1 6000k

hoppy suggested using 3 layers of screen, i ended up using two layers and felt that it sufficed. i didnt get an abundance of algae, and my plants were happy, so that is a win in my book.

i couldnt tell you the technical aspects of it though.
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Old 11-02-2012, 06:05 AM   #3
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I tested Home Depot fiberglass window screen, insect screen, and found that each layer of it drops the light intensity, PAR, by 40%. So, with one layer you have 60% of the light go through. Two layers let 36% of the light go through.
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Old 11-02-2012, 01:25 PM   #4
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Quote:
Originally Posted by Hoppy View Post
I tested Home Depot fiberglass window screen, insect screen, and found that each layer of it drops the light intensity, PAR, by 40%. So, with one layer you have 60% of the light go through. Two layers let 36% of the light go through.
Thanks for the info. I found that 60% of 13w is 7.8, less than my 10 watts. The 10s are already considerably darker than the 13s, so I won't be using the screen. This is the information I was looking for.
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Old 11-02-2012, 02:49 PM   #5
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Watts Per Gallon doesn't really apply anymore.

But you'll likely be fine with two 13-watt CFLs. If you run into algae issues, you can always add a bit of screen.
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