andy Posted July 15, 2008 Share Posted July 15, 2008 Very interesting reading at Advanced Aquarist: Feature Article: Metal Halide Lamps - Aging Over Time: XM, EVC and Giesmann Coral 400W Mogul Lamps Interesting points: Bulbs run on magnetic ballasts actually increase PPFD output over time Bulbs lose their blues first The Penn State tanks run a 12-hour photoperiod Sanjay replaces his personal bulbs every 15 months Implication: If you can deal with the color shift, you can run bulbs for a lot longer than 12 months. Quote Link to comment Share on other sites More sharing options...
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