Hi
In each lamp when you will take cover out it will give better PAR.
In ATI Sunpower when you will remove splash shield PAR also will be higher than with it.
To be honest, there were (on RC) comparisons in PAR between Diuna and Sunpower - and it was quite similar(that comparison was made by Customers, I need to look for it).
220-240 PAR on sand is enough to grow acropora corals, in natural reef where we did light measurements(on 1.5, 4, 6 and 10m) best looking colonies of corals(and plenty of species) gwor on PAR between 250 to 400.(strongest colours).
Acropora species growing on shallow water(up to 1.5m) were mostly brown(but they shouldn't using that kind of thinking - more PAR - better colours) right? ;-)
Of course, that PAR is changing during the day(with maximum about 11.30am in sunny days) however we need to remember about one important thing: light is only one of three important factors which make our corals colourful and healthy.
More important are stable water parameters like alkalinity, and very low, but discoverable NO3 and PO4 and proper key micro elements levels - like iodum(needed daily doses because it drop very quickly) , potassium(please see that K levels in natural sea water are only little lower than Calcium - it's third element after magnesium and calcium!) and of course - feeding.
If light would be only one most important - there should be tons of TOTM level aquariums and every Sunpower user should have amazing acropora corals(or other stony corals), with ultra strong colours. Right? ;-)
Regards
Przemek
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