2x 150w's or a 400W?

Discussion in 'Lighting' started by pXius, 3 Dec 2011.

  1. pXius

    pXius

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    Hey guys!

    One of my mates switched tanks this week and got hold of a 400W mh, so just for fun, we put it on the tank to see what it looks like.

    First off, the tank is 700mm high.
    Option 1: The fixture with the 2x 150's is almost on the water level.
    Option 2: 400w mh, 50cm from water level.

    Now even though we can cover the whole tank with the 400w at a lower level, the center brace gets too hot so it needs to be 50cm high.

    In regards to colour, the 150's are closer to 10000K and are due for replacement. The 400w is a 14000k hence the extra blue.

    Which option will be better? The 150's look brighter but that could be due to the colour temperature. Colour pop on the 400w is better due to the 14k.

    (Note that both Mh's options are supplemented with 4x 54w T5's not in pic.)

    Thanks guys.

    [​IMG]

    [​IMG]
     
    Last edited: 3 Dec 2011
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  3. Annoying

    Annoying

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    I would go with the 150's as you get better spread of the light over the tank. With the 400 you lose a lot of the light due to the hight that it is from the tank. Just change the bulbs on the 150's if you want to get the nice blue sheen.
     
    Last edited: 3 Dec 2011
  4. Tobes

    Tobes Retired Moderator

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    I would also go for the 2 x 150. You also save 100w of energy.
     
  5. pXius

    pXius Thread Starter

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    He has 6x T5's.

    What colours would you use?
     
  6. Annoying

    Annoying

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    If the mh are 10000K then I would recommend the t5's more on the blue range of the lighting spectrum. Maybe two 14000K two coral blue and 2 actinics will work great to give the blue effect.
     
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