We've moved to new platform. Passwords set before 24th July, 2014 will not work. Please reset your password, follow this link if help needed.
  1. We want to see anything and everything that is in your saltwater aquarium! FISH - CORAL - INVERTS - EVEN INTERESTING AQUASCAPES - WE WANT IT ALL!! To enter, post your picture in the "PHOTO CONTEST!!" thread under the Photography Forum *CONTEST ENDS SUNDAY AT MIDNIGHT EST*

How long should lights be on

Discussion in 'Tips and Techniques' started by drsteve2001, Dec 29, 2009.

  1. drsteve2001

    drsteve2001 New Member

    I have a 250w MH with 8 blue leds on it, on a 54 gallon corner tank. How long should i be runnng MH and blue leds?
  2. flower

    flower Active Member

    Originally Posted by drsteve2001

    I have a 250w MH with 8 blue leds on it, on a 54 gallon corner tank. How long should i be runnng MH and blue leds?

    12 hours of daylight, and 12 hours of night. You can break up the time MHs are on with actinic lights, any way you want. Blue LEDs ...
  3. spanko

    spanko New Member

    Another consideration would be the heating of the tank due to the metal halide. You can get away with 8 hours and less of daylight and still supply your tank with enough light for coral and critters. What fixture is it that you have?
  4. drsteve2001

    drsteve2001 New Member

    don't laugh i bought it before i read neg reviews...the odyessa 250watt with 2x4 LEDS...the wife could justify 100 bucks not 300 but that sucker is bright...before i had just 1 18w actnic and one 18w 10000k=36w. So far no problems, my temp was been getting up to 80 though is that to high? that is on a 8 hr burn of the mh. Also if i leave MH on for 8 how ong on the blue? ouple hrs in am and then couple in pm?
  5. keith gray

    keith gray New Member

    Word for the wise. get timers. I have mine set for actinic to run about 10 hours a day and the white come on 30 mins before and go off 30 mins after.
    I use to run them longer but I keep alage down some by not runnin them as long
  6. ser-specv

    ser-specv New Member

    i do 8hrs of T5s/day.
  7. usmcpfc

    usmcpfc New Member

    ok since were on the subject could you guys help me out too
    2 400 w mh 10k
    2 96 w 36 inch 14k t-5
    2 96 w actinic
    how long each should i run these?
  8. spanko

    spanko New Member

    Again to me it really depends on what effect the lighting has on temperature in your tank but if it does nothing to temp I suggest;
    2 96 w actinic 12 hours
    2 96 w 36 inch 14k t-5 come on one hour after actinics and run 10 hours
    2 400 w mh 10k come on one hour after 14k T5s and run 8 hours.
    So the cycle looks like actinics come on, one hour later 14ks come on one hour later MHs come on then after 8 hours MH goes off, one hour later 14k T5s go off, one hour later actinics go off.
  9. bswe22

    bswe22 New Member

    Originally Posted by spanko

    Again to me it really depends on what effect the lighting has on temperature in your tank but if it does nothing to temp I suggest;
    2 96 w actinic 12 hours
    2 96 w 36 inch 14k t-5 come on one hour after actinics and run 10 hours
    2 400 w mh 10k come on one hour after 14k T5s and run 8 hours.
    So the cycle looks like actinics come on, one hour later 14ks come on one hour later MHs come on then after 8 hours MH goes off, one hour later 14k T5s go off, one hour later actinics go off.
    That would make a great sunrise and sunset affect.
  10. usmcpfc

    usmcpfc New Member

    thanks for the times and advice looks like we gonna go buy some timers.
  11. geoj

    geoj New Member

    I am now running one 250w XMs 15k MH 5 hours a day with four 1w 460nm LEDs ran 8-10 hours a day. And I am getting some good growth out of some SPS.
  12. starfishprime

    starfishprime New Member

    If its a 38 gal how long should my light be on?
    I have two 36 watt T-5s, one actinic one daylight
  13. wangotango

    wangotango New Member

    Originally Posted by starfishprime

    If its a 38 gal how long should my light be on?
    I have two 36 watt T-5s, one actinic one daylight
    8-10 hours is all you need.

Share This Page