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What lighting changes will have a positive impact on the reduction of algae?

  • Reduce lighting period

    Votes: 119 32.1%
  • Reduce lighting intensity

    Votes: 45 12.1%
  • Reduce lighting period and intensity

    Votes: 83 22.4%
  • Program a "noon" burst of light (ie 3hrs 1.5wpg, 4hrs 3wpg, 3hrs 1.5wpg)

    Votes: 36 9.7%
  • Program a lights off "siesta" (ie lights on 5hrs, off for 5hrs, on for 5hrs)

    Votes: 33 8.9%
  • Change the spectrum/color temperature of lights

    Votes: 24 6.5%
  • I don't know: I never have algae! ;-)

    Votes: 31 8.4%
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In order of efficiency of lumens/watt:
T5
T8
T5 HO
Power Compact *
T10
T12
T12 VHO
* I have a spiral twist hydrobulb that claims to be better than metal halide, but provides no proof for this on the bulb package :)
What is the difference between T5 and HO T5, and why is "non-HO" T5 more efficient? I thought HO T5 i.e. linear 5/8" dia. 24w, 39w, 54w, 80w were the most efficient...
 
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