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With what? I only have my eyes and the reaction of my corals, no meters to actually measure anything light wise.Did you check when lens had any impact on spectrum?
If anybody would like to visit me with a PAR meter (I in North Wales UK) they are more than welcome and take some readings both with and without my diffusers fitted. Coffee and biscuits provided.Interesting but so far the OP has not tested with a PAR meter. Standing by for updates...