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Old 11-04-2013, 10:00 PM   #1
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How do you figure par?

I have been wondering how you figure par. The closest I could find put mine stupid high but that was with my brand fixture but several inches longer than the one I have. Would I have to get a meter or is there another way to figure it and at least get a close number? Do I even need to?
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Old 11-04-2013, 10:10 PM   #2
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What kind of light is it and inches?
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Old 11-04-2013, 10:15 PM   #3
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Odyssea T5 Aquarium Lighting My tank is a 37g tall and from the light to the substrate it is 20 inches.
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Old 11-04-2013, 10:25 PM   #4
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Use a PAR meter or there are methods using a dslr. There are calculators online.
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Old 11-04-2013, 10:37 PM   #5
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I have no idea dslr is and I will look up a calculator. I really can't afford a meter atm.
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Old 11-04-2013, 10:53 PM   #6
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Pretty much impossible to get PAR without a meter. There's too many variables.
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Old 11-04-2013, 10:57 PM   #7
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Dslr is a camera, Digital single lens reflex. Nikon Canon Olympus Sigma Leica. Hope that helps a bit. You may be able to rent the PAR meter. You can rent lenses but I'm not sure about cameras.
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Old 11-04-2013, 11:01 PM   #8
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Quote:
Originally Posted by Sillyfishies View Post
Pretty much impossible to get PAR without a meter. There's too many variables.
Agreed, I've read about various methods but they yield varying results. Some idea can be gained which involves metering white balance setting f stop and ISO then letting the camera pick the exposure time, this info of ISO F and E is entered into a calculator. Sounds complicated to me.
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Old 11-04-2013, 11:02 PM   #9
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If you want an inexpensive PAR meter that seems to be reasonably accurate for good "estimates", there's a guy named Hoppy on TPT that sells DIY PAR meters.

http://www.plantedtank.net/forums/sh...490&highlight=

Otherwise, you can use charts that estimate PAR based on a few factors: 1. Number of bulbs, 2. Reflector quality, and 3. Distance.

Based on those factors, which I "think" Odyssea is known to have "fair" reflectors, you can extrapolate a best guess using this resource (3rd chart probably):

http://www.plantedtank.net/forums/sh...05#post1038305
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Old 11-04-2013, 11:16 PM   #10
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"a nods as good as a wink to a blind man"
Distance is a factor as is number of bulbs and reflectors will increase intensity, agreed.
Many factors come into play including turbidity and surface agitation.
This can only be taken into account by some kind of light meter.
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Old 11-05-2013, 07:23 PM   #11
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Old 11-06-2013, 02:54 AM   #12
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This is gonna make me sound stupid but what is par?
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Old 11-06-2013, 03:28 AM   #13
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Old 11-06-2013, 11:15 AM   #14
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It's essentially a quantitative measure of light derived from counting photons in the range of light that plants can utilize.
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Old 11-06-2013, 12:28 PM   #15
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It's essentially a quantitative measure of light derived from counting photons in the range of light that plants can utilize.
Awesome! Thanks for the explanation.
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Old 11-08-2013, 05:02 AM   #16
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May help, may not!

KELVIN LUX LUMENS PAR PUR
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