Okay, I measured the PAR again today....same readings as above, with mesh on and off...315 and 330 umol m-2 s-1, respectively. Also took a measurement with the glass top (clean) over the tank. The measurement was 299 umol m-2 s-1 with the pumps off. So, the mesh top provides better light penetration than a clean glass top.
Incidently, above water the PAR reading was over 1500 umol m-2 s-1. As soon as you go under water, the reading is cut below 400 umol m-2 s-1.
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