400w or 150w MH?

Discussion in 'Lighting' started by ken, 1 Nov 2011.

  1. ken

    ken

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    Hey guys... I'm planning my upgrade and I'm going the zeo route.. Tank will be sps dominated... The tank is 1250x550x500.. Wat lighting should u rate I use.. I've got 2 400w mh and 2 150w mh.. Which of the two do u think I should put on? Any suggestions welcome
    Thanx guys
     
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  3. dallasg

    dallasg Moderator MASA Contributor

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    the 400w will cover more of the tank, the 150 might make shadows
    but going 1 400w MH with t5 suppliments should be perfect

    could even try 2 x 150mh about 50cm appart with some t5's and that should cover everything
     
  4. toppdogg

    toppdogg

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    If you want to save on electricty then go 150w
    if its not and issue then go 400w
    like Dallas said just suppliment with t5
     
  5. Tremayn

    Tremayn

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    I have seen tanks on the zeo forum with just 6 T5's in sps tanks. You should go for either 2x 400 or 2x 150. On that depth you can get away with 150's, the beauty of a shallower tank ;)
     
  6. ken

    ken Thread Starter

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    Thanx guys... Ill go with the 400w.. Wat globes should I use tho.. 15000k or 20000k... And the t5's 20 000k or 15000k? Ill try one halide and supplement it with t5's and if need be ill run both 400w.. And @dallasg.. Wats ur thoughts on running zeo on breeding setups?
    Thanx dudes
     
    Last edited by a moderator: 26 Nov 2015
  7. irie ivan

    irie ivan MASA Contributor

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    2 x 150w is fine, supplimented by 2-4 t5 would be awesome. 2 x 250 would be best option. Ensure you have decent globes though for the 150 halides. 2 x 400 would be a bit overkill on the elec bill for such a small tank. Doubt whether your corals will appreciate such strong lamps, bear in mind that there is a point where photosynthesis slows down, regardless of the increase in lighting intensity. Likewise for flourescence.
    Bear in mind that sps dont neccescary live in high light environments because they love it there, they do so because they have evolved the ability to survive there.
    With 2 x 150 and two decent t-5's you should get great colouration, depending of course on nutrient, flow, metals and alk.
    Also 2 x 400 would have to be quite high above water, lots of wasted light due to spread and some cooling issues.
     
    ken and seank like this.
  8. lIghty

    lIghty

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    I had 2 400w on my tank which was 1.4 x 0.6 x 0.55, it offered very good coverage on the tank, as well as my back yard from the light coming through the windows. The lights where about 250mm above the water level.
     
  9. irie ivan

    irie ivan MASA Contributor

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    :lol:
    :lol:
     
  10. ken

    ken Thread Starter

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    Thanx guys for all ur input.. Some of u really know ur business
     
  11. dallasg

    dallasg Moderator MASA Contributor

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    @ken i think it would work just as well, while additives and chemicals help, the husandry of the reefer is paramount!
    it also might cost a little more, but would work
     
    Last edited by a moderator: 26 Nov 2015
  12. Tremayn

    Tremayn

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    Try and have a look at different MH globes in person. Globes are different so a reeftek 20k will be different to a giesmann 20k
     
  13. ken

    ken Thread Starter

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    @ irie ivan... I've installed the 400w mh but somehow my 150 mh seemed a lot brighter... Do u think its time to buy a new globe? Its lifted 250mm off the surface and the 150 was 200mm off the surface
     
  14. dallasg

    dallasg Moderator MASA Contributor

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    remember visual emitted light is not the same as PAR and PUR
    so while it looks brighter, the usable light is different
     
  15. irie ivan

    irie ivan MASA Contributor

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    As dallas said, its not something you can judge with the eye, especially considering different Kelvin ratings. Even two lamps coming off same assembly line with same kelvin rating will have different actual K output.

    Also, bear in mind that combined with reduced intensity, there is a colour shift as globes age, and at some point the colour shift still occurs but the drop in intensity is less pronounced. This is often a influencial factor swaying the buyer towards a higher K rating globe.
     
  16. dallasg

    dallasg Moderator MASA Contributor

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    @ken check the zeovit thread for my replies :)
     
    Last edited by a moderator: 26 Nov 2015
  17. ken

    ken Thread Starter

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    Ok.. Makes sense.. Thanx buddy
     
  18. ken

    ken Thread Starter

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    Thanx man.. I rate ill buy new ones as these are quite old.. But ill stick with the same kelvins
     
  19. ken

    ken Thread Starter

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    Ok cool:)
     
    Last edited by a moderator: 26 Nov 2015
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