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... but is there not also a range past light is of diminishing returns?
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Actually JBNY found out that the ballast bulb combo he had been using was too much light for some of the corals higher up in his tank.
Excerpted from JBNY's thread on RC
250 Watt SE Bulbs Compared
Page 27....
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I am now running (3) 250 watt Ushio with (2) 140 watt VHO URO Actinics. MH Ballasts were swapped out to an Icecap and the VHO Ballast has always been an Icecap 660.
did away with my HQI ballast and opted for the Icecap electronic. In my case I felt I had too much lighting (I know, that seems impossible). Many of my corals that were very high up would always get very pale and stay that way. Also the heat from the PFO HQI was something that was really making my chiller work hard during the summer. Lastly, I saved about 250 watts total stepping down from the HQI. I also felt the electronic ballast was slightly more blue.
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So it would seem the answer to your question is yes, Mark.
Nick