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Performs best is based on tank surface you want to cover and somewhat design goals (want an "island" hotspot light on the surface or blanket coverage)Did you mean that the alie bars will create hotspots? The XR15 perform best at 8” mounting height.
I honestly think people don't spend enough time on figuring out the simple geometry involved here.
A large sheet of paper or white surface and a ruler. This gets one the max input vs min spill.
you want to get fancy simple lux meter at like $15 helps. Relative values.
Once in the tank the par meter takes over.
Sometimes its hindered by aesthetic needs though.
At 8.5" and 120 degree spread doubt if it can create a serious hot spot BUT depends on the lens design.
Never say never.
Kessil pattern:
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