Why manufacturers don't post PAR read ever? (or ONF lighting problem)) - Page 2 - The Planted Tank Forum
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post #16 of 18 (permalink) Old 10-14-2020, 06:42 PM
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Does this calculator work well enough for a ballpark par estimate?

https://rotalabutterfly.com/light-calculator.php
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post #17 of 18 (permalink) Old 10-14-2020, 06:45 PM
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Once you use any source of light, the brightness reduces by about 15-20% in the first few weeks. Then for the next few months the amount of light gradually reduces. You have a continuously varying Par value for the lights that are used. This is true for MH, PLL, T5/T8, CFL blubs. I'm not so sure about LED's. This may be one of the reasons no one specifies the values.
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post #18 of 18 (permalink) Old 10-14-2020, 06:59 PM
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Quote:
Originally Posted by *Ci* View Post
Does this calculator work well enough for a ballpark par estimate?

https://rotalabutterfly.com/light-calculator.php
I just tried it out and it gave me 22 PAR at substrate, which feels about right. Just one anecdote though.

“Science, my lad, is made up of mistakes, but they are mistakes which it is useful to make, because they lead little by little to the truth.” -Jules Verne
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