I would have to go digging for the article since it was some time ago.
They stated that the avearage reef in tropical zones recieves an average of 80-95 days a year of unfiltered sunlight.
The rest of the time the sun is partly blocked or totally blocked by storm/rain clouds and on rare occasions volcanic dust and more often by dust clouds from Africa (depending on location).
So a few days of darkness or subdued lights such as actinics would actually be more natural then blasting them with a thousand watts 14 hours a day seven days a week year round.
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I know enough to know I know nothing.
Current Tank Info: 55 Marine. 29 Freshwater planted.
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