How to find lumens and/or lux?
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Old 04-06-2006, 03:33 AM   #1
otter
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How to find lumens and/or lux?


I'm starting up a 5g bowfron shrimp tank. I ordered the highest wattage fixture I could find that would fit over the tank. The dimensions of the tank are: 14"L x 6.5"W & 9.5" wide at the widest part. The fixture is a Coralife 12" 2x18W. I'm trying to figure out the minimum light threshold formula as described in Rex's guide. How do I determine the lumens or lux if it's not listed on the bulb?
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Old 04-06-2006, 12:40 PM   #2
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You will be fine with that amount of light. If you have good reflectors you might only need one bulb depending on what you want to grow.
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Old 04-08-2006, 01:57 AM   #3
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Thanks Rex! The fixture came with 50/50's, but I'm replacing them with 6700's, was this necessary?
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Old 04-08-2006, 02:49 AM   #4
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Lux = lumens per square meter.

To measure it, a luxmeter or a light meter is used.

"Photographic exposure meter can also be used by converting the diaphragm and exposure times" ----> taken from a book and I dont know what does it mean in simple practice. Hope someone can explain this in simple step by step way. Lightmeter is all over all med-high end cameras (and a standard in all SLR)
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Old 04-08-2006, 02:57 AM   #5
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I can borrow a lux meter from one of our projector service guys, my camera is not pimped enough to have that feature. I'll see what I can decipher and report back.
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Old 04-08-2006, 03:17 AM   #6
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Some simple data that I collected from a source:

500 lux : Cryptocoryne nevii, wendtii, afinis, java moss
500-1000 lux : anubias nana, aponogeton madagascariensis, echinodorus sp, sagittaria sp
1000-1500 lux : aponogeton sp, bacopa caroliana, egeria densa, ludwigia sp, marselia sp, ceratopteris thalictroides, java fern
1500+lux : cabomba sp, hygrophylla poliserma, limnophila aquatica, myriophyllum sp, riccia fluitans, vallisneria sp
2000+ lux :cabomba furcata, rotala macrandra

9000-14,000lux : succulents
10,000-15,000 lux : young trees
50,000-60,000 lux : cereals
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