Kessil

XR15 G5 PAR

Reflection is huge. It isn‘t unusual at all to have twice the PAR at the bottom front of the tank vs the bottom back if there is black backing the decreases reflection in the back.
 
Watch the BRS video on the xr-15
. With the light mounted 9 inches above the water and measured 6 inches below the water, the center par is 268. Measuring 11 inches below the water, 150 PAR doesn't sound wrong.

View attachment 24130

Also in this video
they show measurements at 6inches, 12 inches, 18inches (not at full power but just so you get an idea of how much PAR is lost with increased depth). As you can see at 12 inches below the water you lose almost half of what is at 6inches. So if 6inches full power is 268 then 11 inches at 150 sounds right.

View attachment 24131
Yup. The matches my measurements with the G4 pro XR15s when i set up my lil 5G bucket. Plus up to 20% reduction with diffuser
 

I love mine on my xr30
 

I love mine on my xr30

I looked into them but they don’t add much PAR.
 
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