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I have a 90 BML regular high on my 75g and I hung it about 3" above my tank. My PAR is still about 55, according to my Apogee PAR meter and only drops to around 48-50 at the glass. Just for reference.

I have two 72" 90s hung over a 125g about 4" and get 125-130 PAR at the substrate and drops to 118-119 at the glass.
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