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Old 05-21-2009, 11:06 PM   #1
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Lights

Hi, I have a 600l reef tabk with a set of Aqua One MG1200 light, 2 x 150W 10,000 Kelvin Metal Halide lamps and 4 x 24W blue PL lamps and I was wondering how long should the white and blue lights stay on for and how far from the top of the water they should be?
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Old 05-22-2009, 12:43 AM   #2
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The "white" lights/halides should be on for 6-9 hours a day. You can use the "blue lights to turn on an hour before the halides and turn them off an hour after the halides to create a dusk/dawn feature. Plus it is pretty cool to have two different colors for the tank at different times. I keep my halides on for only 6-hours a day and my actinics for 8-hours and this seems to work fine for me.
The halides should generally be 8"-12" off the surface of the water. A lot of this depends on your reflector. Just don't put them too close because they get very hot.
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Old 05-22-2009, 02:26 AM   #3
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Thanks very much, I just have a little algae problem. I will see how I go.
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Old 05-22-2009, 02:40 AM   #4
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If you have an algae problem then definitely use the lowest photo period time. Also check your RODI water and think about running a phospate reactor.
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Old 05-22-2009, 02:57 AM   #5
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Hey Thanks I am running a phospate reactor in the sump and all levels are good. I checked my light times they are 13 hours for the halides and 10 hours for the blue lights and the light is about 13 inchs from the water.

I will change the light times and see how I go
Thanks again
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Old 05-22-2009, 03:38 AM   #6
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Quote:
Originally Posted by Ben Jarrett View Post
Hey Thanks I am running a phospate reactor in the sump and all levels are good. I checked my light times they are 13 hours for the halides and 10 hours for the blue lights and the light is about 13 inchs from the water.

I will change the light times and see how I go
Thanks again
Yeah, cut the halide time in half. The coral doesn't need 13-hours and the algae love it.
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Old 05-22-2009, 03:47 AM   #7
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Sorry the blue are on for 13 hours and the whites for 10 hours.

I have set them to 8 hours for the white and 10 hours for the blue

Sorry
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Old 05-22-2009, 03:58 AM   #8
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one other thing I forgot to mention is how old are the halides? Old bulbs can cause algae issues too.
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Old 05-22-2009, 04:05 AM   #9
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About 12 months, the whole tank is only 12 months
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Old 05-22-2009, 04:57 AM   #10
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At 10hrs a day, your Halides may be due for a change. They start to lose intensity after 10 months or so. That may be the reason for your algae bloom.
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Old 05-22-2009, 05:14 AM   #11
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Do they only last about 3000 hours? and what about the blue lights?
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Old 05-22-2009, 07:02 AM   #12
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Old 05-22-2009, 12:26 PM   #13
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"24W blue PL lamps"? Are these compact fl lamps? I don't know about these. I know that the t-5 HO"s can last 12-16 months.
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Old 05-22-2009, 08:21 PM   #14
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Thanks for that I will replace them and see how they go.
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