PAR guesstimates? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 01-24-2016, 08:33 PM Thread Starter
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PAR guesstimates?

I have a 4xT5HO fixture. 36in with individual reflectors. It's a Wavepoint fixture specifically. Bulbs are 2 Zoomed 5k Max Plant Growths and 2 Zoomed 6.5k Ultra Suns. It's hung 25in from substrate on a 40B. I can't tell much of a visual brightness difference between 25-18in from substrate but I'm sure there is a huge PAR difference.
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post #2 of 6 (permalink) Old 01-24-2016, 09:21 PM
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At 25" probably in the 90-110 range. That's a guess based on a couple of my own 48" units with good reflectors, testing with a Hoppy meter, could be a little more or less.
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post #3 of 6 (permalink) Old 01-25-2016, 12:47 AM Thread Starter
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Since most the graphs I see make the distance appear to have exponential impacts on PAR I thought it would be far less. Not doubting you just surprised.
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post #4 of 6 (permalink) Old 01-25-2016, 01:10 AM
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My 4 bulb 48" cheap hydroponic unit will easily hit 130-135 at 24" if Im running all 6500Ks for example. It has individual reflectors which are good, but not great. Your WP probably has better.

I run 3 out of 4 red/pink bulbs which brings the PAR down into the 110 range. The ZM Ultra is a higher PAR bulb than the Flora. Im currently using both.

Not sure if there is much difference directly underneath between a 48" and a 36" unit. My guess would be not much.

So like I said just guessing, can probably count on having at least 90-ish though

Last edited by burr740; 01-25-2016 at 01:28 AM. Reason: .
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post #5 of 6 (permalink) Old 01-25-2016, 02:09 AM
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Over certain ranges, and esp in water w/ multiple point light sources there are 'linear" sections..


"A man with a watch knows what time it is. A man with two watches is never sure."
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post #6 of 6 (permalink) Old 01-25-2016, 01:17 PM Thread Starter
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I guess that's a real good point, it does level off big time in that distance.
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