95% of algae related issues are from CO2, not light changes, less light
= less algae in virtually all cases.

If you have 2w/gal or more of PC lightingm, you are far above the
minimum light compesation point for aquatic plants even if you had a
60% decay of PAR from the lighting.

Algae prefer more light than plants, basically plants are more
efficient at less light.

Regards,
Tom Barr

www.BarrReport.com