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Thread: How long do you leave your Metal Halide on?

  1. #1
    Join Date
    01-16-2010
    Location
    San Antonio, TX
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    Default How long do you leave your Metal Halide on?

    Lets hear it. I have read so many different recommendations for how long to run MH lights for a reef tank. How long do you run your lights for? If you could include the wattage, color temp, and if its a reef tank or a FOWLR tank. Thanks!
    - Rick
    20 gallon nano! Back to basics!
    www.arccphotography.com

  2. #2
    Join Date
    08-28-2007
    Location
    Bulverde Rd. SA/TX
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    Default

    Reef tank

    -2 x 250w MH 14k, run from 4pm-11pm = 7 hours
    -2 x 460nm Blue Leds PowerBrite modules, run from 11am-3am = 16hours
    -1 x Refugium flood light 90w, run from 1am-9am = 8hours

    Tank currently stays at 77 degrees when no lights are on, 78 degrees while fuge light is on and 79 when MH turns off. I used to run the MH for 8 hours and I would hit 80 degrees. I also run a fan over the fuge when the MH is on.

    There's no secrets here, pick a time and adjust up or down in half hour increments every couple of days until you get what you like. I also had unwanted algae growth with 8 hour MH cycle...cut it back to 7 and that helped. I've been thinking about dropping it to 6 or 6.5 too.

  3. #3

    Default

    Small tank (20g hex reef):
    150w MH, don't remember the k, ~9 hrs / day

    Big tank (210g reef):
    2 x 250w MH w/ 12k Reeflux bulbs, ~7 hrs / day
    (also run 6 bulbs of T5s ~14 hrs / day!)
    - Kristy and Mike -

    210 g reef tank started 3/15/08; 20 g hex reef tank started 1/3/08, ended 3/30/14

    "I must be a mermaid.... I have no fear of depths and a great fear of shallow living." - Anais Nin
    "To travel is to take a journey into yourself." - Danny Kaye

  4. #4
    Join Date
    05-02-2007
    Location
    Live Oak
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    Default

    I have 2 250w 20k that are a year+ old so they stay on for 10 hours. I would replace the bulbs but am getting new fixtures for the new tank.
    Kevin- 375 Gallon Reef

    Reefing made easy...

  5. #5
    Join Date
    01-16-2010
    Location
    San Antonio, TX
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    Default

    I just want to make sure im not over running my lights. I have a 100 gallon tank 48x24x20tall and I run 2 250w DE 20k XM mh 8 hrs a day. I dont see a big temp swing durring the day probably because I keep the cieling fan on all day long. I dont use any supplemental lighting at all with it. The only lights I use other than this is my fuge light at night after display lights go out.
    - Rick
    20 gallon nano! Back to basics!
    www.arccphotography.com

  6. #6
    Join Date
    10-23-2008
    Location
    San Antonio (stone oak)
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    5,417

    Default

    2x 250MH 14 k for 8 hours on a 75 gal tank
    Jack

  7. #7

    Default

    1X 150MH 20K 4 hours a day on a 30 Cube

  8. #8

    Default

    2 x 250MH 10k for 10 hrs on a 140 gal

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