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Old 07-21-2020, 07:55 AM   #11 (permalink)
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Default Re: diy led lighting assistance needed

Quote:
Originally Posted by mistergreen View Post
You want 50-60PAR at the substrate. That's considered high light. So that's about 55cm for your tank.
Your cree specs says Max Light Output (lm) 1052 lm. It doesn't say at what distance though.

You can convert lumens to PAR or PPF roughly.
https://www.waveformlighting.com/hor...ine-calculator
Lumens are the total amount of light emitted by the LED, not the intensity - amount of light on a surface per square meters. So, there is no way to convert lumens to lux or PPF. You can make a crude conversion from lux to PPF (PAR units), but you really need a PAR meter to measure that actual intensity. And, that reading varies with distance from the light source.
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