Alex, most of those people that are running halide lamps for 5-6 hours are still running supplementary lighting for 10-14 hours a day. Alot of these people are using so much light that the corals can only take it for a few hours a day. I understand what these people are trying to accomplish and it can have great results, but I still prefer to run less intense lighting for longer periods.
In a reef tank you can't really light starve algae because it will starve your corals too. So the only real option is to starve algae of the nutrients it needs, which is mainly nitrogenous compounds and phospates.
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