Lights- help please

Discussion in 'Lighting' started by seank, 17 Aug 2010.

  1. seank

    seank

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    Please assist me in lighting as I am not too much clued up in this department.

    I have 2x400w plus 2x250 w Metal Halides plus 4 T5's- It boils the water and very expensive to run.

    After I read Viper's thread wrt the T5 lights, I would like to move over to T5 lighting in total.

    My surface area of the tank is 2.5 meters long by 900mm wide (2.25m²) and the tank depth is about 1.3meters from top of sandbed to where the lights must hang.


    1.) I need to know how many lights I need to provide sufficient lighting for the coral.

    2.) And how would one go about- The 54w T5's or the 80w ???

    Please explain in simple terms as well as give concrete answers.
     
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  3. Ridwaan

    Ridwaan

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    Did you maybe look into going the natural sunlight route?
     
  4. seank

    seank Thread Starter

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    Nope, that would mean to break off my Roof above the tank, and the roof was not designed to go that route
     
  5. jacobuseugene

    jacobuseugene

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  6. chikaboo

    chikaboo

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    Is this your old tank ? Or full glass now? Inside or part outside
     
  7. seank

    seank Thread Starter

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    Old tank revamped- still looks the same, only deeper
     
  8. seank

    seank Thread Starter

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  9. chikaboo

    chikaboo

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    Cool .... All the better to get inside ...... So what about not removing the roof but using like those skylights coupled with MH and some T5's .... Was also remembering what you said about your'lls weather patterns in RBay ..... might be advisable to go with T5's so that the chiller is not overtaxed!
     
    Last edited: 17 Aug 2010
  10. viper357

    viper357 Admin MASA Contributor

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    Bear in mind it is generally accepted that T5's are capable of sustaining corals at about 60cm's depth, any deeper than that and your corals will begin to suffer from insufficient lighting.

    On a 2.5m tank I would go for 54w's as they are 1.2m in length so put 2 in line and you get coverage of 2.4m's, whereas 80w's are only 1.5m in length, unless you stagger the lighting. With such a deep tank it might be a good idea to squeeze in a couple of 80w's as they might provide slightly better depth penetration as opposed to the 54w. You're still going to struggle with corals in the lower parts of your tank, can you not consider some 150w MH's? If you use the standard radiant light fittings then they use up very little space and you can still place sufficient T5's on either side of them.
     
  11. durleo

    durleo

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    I think ur tank is a bit deep for the T5 to penetrate all the way to the bottom - unless you dont plan on putting anything near the bottom. T5 will probably give better colouration but Metal Halide is gonna give you the ideal penetration. It would nice if you can build a skylight like Bob(the reef builder) and use the T5 for viewing pleasure.
    I think the difference between 54w and 80w is the lenght. So for ur tank 2x 54w will cover 2.2m whereas a 80w is 1449mm. The price of replacing tubes might be an issue if you consider that 24w Reeftek tubes sell for R90 and the 54w sell for R100.
    In all honesty i think ur gonna be stuck with majority Metal Halides.:)
     
  12. seank

    seank Thread Starter

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    Thank you. But how many t5's do I need in total then??

    I am busy reading the link given by jacobuseugene, and I am halfway down, just to figure out that I did not even remember what I've read in the first half, or rather, did not understand.

    Please bare in mind that I need to run all these stuff thru inverters etc, as I tried last year when we still had load shedding, and I could not even get 01 metal halide to operate
     
  13. Manic

    Manic Moderator

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    The reeftek tubes only penetrate 60cm's but if you go with quality like ATI, Aqua Medic or giesemann then they will easily penetrate up to 80cm's.
     
  14. seank

    seank Thread Starter

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    Durleo, I am looking at Giesmann Tubes (range from R225.)
     
  15. seank

    seank Thread Starter

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    This is what is said on the link:

     
    Last edited: 17 Aug 2010
  16. viper357

    viper357 Admin MASA Contributor

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    There is no need to have your lighting on backup power, your tank and corals can survive 3 days in total darkness.

    The quantity of T5's will be ultimately up to you, how wide is a reflector, about 10cm's? Let's say 12cm's, so you could fit about 7 or 8 T5's in side by side, if the reflectors touch each other, that is if you DIY the lighting, if you buy a commercial lighting unit then you could maybe go for a 10 x T5 unit as they normally put the T5's closer together. It's all going to depend on how you do your lights, but for a tank that deep I would honestly squeeze in as many as I could. So, let's say each T5 takes up 10cm's then that would be 8 front back for the left side and another 8 for the right side, so 16 in total, but if you put in 80w's then maybe 4 x 80w and 10 to 12 x 54w.
     
  17. Mekaeel

    Mekaeel Moderator MASA Contributor

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    If you can keep the water clear, 24*54W T5's I say. SPS from about 600 all the way to the top and the less light demanding corals at the bottom.
     
  18. durleo

    durleo

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    The point i was making is that a 54w tube might cost exactly the same as a 80w tube but i dont know if you get 80w dual ballasts. I think if you space them 100m apart you prob gonna need 18 x 54w
     
  19. neo

    neo

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    what about using a bunch of 39watt but putting them front-to-back as your tank is 900mm and the 39watt is 830mm (without end caps).
     
  20. Manic

    Manic Moderator

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    The 39W globes don't produce as much par per watt when compared to the 80W
     
  21. durleo

    durleo

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    It would cost more for the tubes and ballasts compared to 54w
     
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