Lighting heat issues

Discussion in 'Beginner Discussions' started by Riddi, 6 Apr 2010.

  1. Riddi

    Riddi

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    Hi All

    Firstly I have done a lot of reading wrt to lighting and the different pros and cons of the different lighting solutions but am a bit unsure of which solution to use on my new build maily due to the temperature aspect of the tank which the light have a great effect on.

    What is the approx temp difference between running a MH (150w) with 2x T5 39w VS 6 x 54w T% light units.

    I do not plan to have a chiller imediately but will be running six fans (pc style) cooling the sump and two over the DT
     
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  3. lIghty

    lIghty

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    Think this could be a very difficult question to answer, just to many factors.

    Taking you are wanting to use 54w T5's, your tank must be about 1.2m or longer, I doubt 1 Mh would cover that length, you might have to use 2.
     
  4. Riddi

    Riddi Thread Starter

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    My tank size is 850x850x600 and do not want to have heating issues which require a chiller hence the question.
     
  5. lIghty

    lIghty

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    850x850x600 ??? H W L?
     
  6. Riddi

    Riddi Thread Starter

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    850 W x 850 L x 600 H

    lighting to be mounted pendant style with the distance between light and water surface 20 cm
     
  7. SIMS

    SIMS

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    I would use either 1x250w 20k MH or 6x39w T5's
     
  8. Riddi

    Riddi Thread Starter

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    thanks
    @ sims what would a 6x39w T5 unit cost?
     
  9. neo

    neo

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    I bought an 8 x 39w unit for R2000 on Friday, new.
     
  10. SIMS

    SIMS

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    No Idea ask Lanzo
     
  11. Riddi

    Riddi Thread Starter

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    @neo pm details on the unit you purchased and from who

    @ sims thanks for the redirect

    Thanks guys
     
  12. SIMS

    SIMS

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    watch out for cheap T5 units. IME they have very low Par output due to crap reflectors and ballasts
     
  13. Riddi

    Riddi Thread Starter

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    which units are the recomended/decent unnits to look out for
     
  14. Tobes

    Tobes Retired Moderator

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    I prefer MH lights as their par value is much higher and they last longer. T5 tubes lasts only 6-12 months for the best light out of them. MH can last up to two years. A MH bulb cost you R650-R750 where T5 tubes cost you at least R140 each, depending on make and wattage, which gives you 6 x R140 = R840. Depending on the tank depth, you can use 150w MH.
    MH also gives that nice shimmer in the water where T5's don't.
    Anyway, it's the reefers choice what he wants and can afford. Some like T5's for their colour combination and some use MH and T5 combo's.
     
  15. lIghty

    lIghty

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    I would agree with Sims on the 1x250W.
     
  16. SIMS

    SIMS

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    Guys I find 4x54w T5's give much better par than 1x250w MH...

    You also need to remember bulb and ballast make a huge diffs
     
  17. Riddi

    Riddi Thread Starter

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    So the heat generated by the t5's (6 or 8) compared to the MH(250w) which generates more ?
     
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