mh vs mh

Discussion in 'Lighting' started by Tremayn, 11 Oct 2011.

  1. Tremayn

    Tremayn

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    Hey guy's .. I wanted to know with Mh is it the watts that matter most or does the size of the globe play a role etc. So what Im asking is would 2x 150w mh push out a bit more that 1x 250w mh?
     
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  3. Tremayn

    Tremayn Thread Starter

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    @Falcon .. you know your lights.. Anyone ..?
     
    Last edited by a moderator: 26 Nov 2015
  4. gMAN

    gMAN with the plan

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    is this a trick question? :whistling:
     
  5. rakabos

    rakabos

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    The wattage is the power consumed by the unit, not necessarily related to output, that is determined by the quality of the bulb itself and the brand me thinks
     
  6. gMAN

    gMAN with the plan

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    I'd say a 250w might work on your size tank but, you would need to suspend higher to get the spread but then you lose the penetration, 2 x 150w suspended lower, more spread & penetration...? and what rakabos said.....
     
    Last edited: 11 Oct 2011
  7. butcherman

    butcherman Moderator MASA Contributor

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    bigger watts for deeper tank
     
  8. Xereo

    Xereo

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    It uses around the same power... You would just get more coverage with 2 lights instead of 1...
    with a cube tank i would go 250w, wide tank 150w x 2...
     
  9. Tremayn

    Tremayn Thread Starter

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    I have 2 x 150w mh's currently. I want to up my lighting and was thinking of 2x 250w but I have another 150w mh laying around, and 250w mh's are like R2800, so it would work out cheaper to get another 150w mh then keep the 150w mh's in pairs so its kinda like having a 250w. My water level is 47cm. I dont think the 150w mh pushes out that much and I have sps
     
  10. Xereo

    Xereo

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    Well for sps i wouldnt even bother with 250w :) id go the full 400w....

    AND guess what i have them for sale at a very good price dude...
    I will give you 2 for R2000.. incl bulbs :)
     
  11. Tremayn

    Tremayn Thread Starter

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    Unfortunately I doesnt have 2k at the moment :( .. but my tank is pretty shallow
     
  12. Tremayn

    Tremayn Thread Starter

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    globe wise I want blv 20k
     
  13. Ridwaan

    Ridwaan

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    im running 1 x 250w mh on my 600mm deep tank that is sps dominated with no problems....sps are growing and colours popping.
     
  14. Tremayn

    Tremayn Thread Starter

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    yeah.. I know 250w is good for sps and more so if your tank is around 60-70 deep
     
  15. Falcon

    Falcon

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    It all relative to your tank size buddy,what your exact specs again?lxbxh? and also what do you currently have in there in total.


    In general 2 x 150w mh will be slightly more efficient than one 250w mh,if we assume the bulbs are the same brand/type/colour.

    A lower wattage bulb give of more par per watt.....not much difference though,its the spread,depth of tank etc that you should be more concerned about.
     
  16. Tremayn

    Tremayn Thread Starter

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    @Falcon ..Tank is 150 long, 70 wide and water level at 47. At the moment I am using 2x 150w mh on the L and R sides then I have 2x 54w actinics which really need to be changed
     
    Last edited by a moderator: 26 Nov 2015
  17. Falcon

    Falcon

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    Add another 150w mh or 2 x 80w t5's.....this should be sufficient.

    If you want crazy growth add both lol.
     
  18. SchyffS

    SchyffS Reef Aquarist

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    How about a pic to backup this statement :)
     
  19. SchyffS

    SchyffS Reef Aquarist

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    what is the lowest rated mh in wattage? 70W? and...
    what is the minimum kelvin rating that can be used on marine (how yellow can you go)

    I was thinking of supplementing my T5 with a halide, a small one, for peak noon duration. about 2 hours only.
    I was thinking that it should be a very yellow light, sunlight spectrum...6000k ?

    What light can i use?
    Can i use an ordinary security halide fixture and bulb? without drivers?
     
    Last edited: 3 Nov 2011
  20. Manic

    Manic Moderator

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    From personal experience, I feel that 1 x 250W provides a lot more light than 2 x 150W. Might be the reflectors but that is just my experience.
     
  21. SchyffS

    SchyffS Reef Aquarist

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    It may be the refelctors, the 250W units have the best fancy reflectors, the rest is just crap. Unless they have improved since then.

    What can you suggest i use to supplement my T5's
     
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