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Old 02/09/2012, 10:06 AM   #1
Sooner7
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LED Numbers??????

Came across this and thought I would share.

Just when I thought things couldn’t get more complex in this hobby….

http://www.vividaquariums.com/apogee.htm


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Old 02/09/2012, 11:36 AM   #2
mutateddogbone
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Interesting read. Does say its only 20% error max though. So for 100 par that would make it 120.


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Old 02/09/2012, 02:26 PM   #3
Sooner7
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I could be wrong but wouldn’t that be +/-20%. Which means you could have 80 to 120 on a regular 100 par reading. That’s a 40 par variance. The larger the Par the bigger the variance. So at 300 par it would be 120 par variance…..

That’s a big difference….


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Old 02/09/2012, 03:45 PM   #4
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It comes across as RB are being under measured by up to 20% and the 650nm spectrum being over measured so for the most part we have higher par then we think with the RB and if you are using reds or a WW leds your reading might be a little high. To account for this I would measure RB par add your 20% then measure whites independently. It would be neat to add these two numbers then compare the difference between that and a par reading with both RB and whites on without adding a 20%.


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Old 02/09/2012, 04:18 PM   #5
kent ashbrener
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Quote:
Originally Posted by ghellin View Post
It comes across as RB are being under measured by up to 20% and the 650nm spectrum being over measured so for the most part we have higher par then we think with the RB and if you are using reds or a WW leds your reading might be a little high. To account for this I would measure RB par add your 20% then measure whites independently. It would be neat to add these two numbers then compare the difference between that and a par reading with both RB and whites on without adding a 20%.
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