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I’m setting up a new 18in NiCrew SkyLed to use on a 10gal low tech shrimp tank. The manufacturer’s stated PAR level at 12in is 95. Okay, I know that’s in air and optimal conditions, but that does seem like an excessive number of photons for my tiny tank. The output of the LEDs can be adjusted. Does that mean if I set the light at 60%, I get 60% of the PAR?
 

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I’m setting up a new 18in NiCrew SkyLed to use on a 10gal low tech shrimp tank. The manufacturer’s stated PAR level at 12in is 95. Okay, I know that’s in air and optimal conditions, but that does seem like an excessive number of photons for my tiny tank. The output of the LEDs can be adjusted. Does that mean if I set the light at 60%, I get 60% of the PAR?
Water and glass tops will reduce the PAR to some extent.
 

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Water and glass tops will reduce the PAR to some extent.
Glass top may cut 10% of the par.
In tank measurements due to refraction and reflection will be larger than free air at depth.
There is some light attenuation mostly in the red spectrum.
 
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