Lights too strong??

Discussion in 'General Discussions and Advice' started by seank, 21 Aug 2009.

  1. seank

    seank

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    Hennie, Alan mentioned that my lights might be too strong, as well as a couple of other guys who phoned me.

    My tank depth is now 1.3m and the lights will be another 400mm above the water, so in total I will have about 1.7m from bottom to lights.

    Thing is, I had 02 x 250 w Mh, 02 x 150w Mh as well as 08 T5x54w in, that totalled about 1300w and I really had a lot of dark areas in the tank- you can see it on the pics I took, not using a flash.

    Where can I get a guru on lights in this hobby that can measure/tell me precisely what I need???

    This is the thread:

    400 Watt Metal Halides - Page 2 - ► Sponsor Request Forum
     
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  3. jacquesb

    jacquesb Retired Moderator

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    Sean - one thing that I have always wondered about - even WITH metal halides - is that the metal halides cast shadows.....
    I personally think, that it is even MORE important to have the metal halides you already have, staggered, or in a quadro-segment - rather than just in a row in the centre of the tank. This way, you would be able to maximize the amount of light into the tank. And reduce the amount of shady areas.

    I hope you understand what I mean.

    So - personally - I think that 250 watt's would be more than ample. BUT, perhaps have 4 or 6 x 250 watt's - one each "quadrant" of the tank (if you divide the tank into quarters), and then 2 on each of the "short sides" of the tank - pointing slightly inwards.....

    Please let me know what you think of this idea?
     
  4. Shaun

    Shaun Retired Moderator

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    Was also going to suggest this, have more 250w but angle some of them to help with shadow's. You can have them on different timers for example 2 on first then later another 2 etc. The only other thing to help with growth is to have them on a rail that moves across your tank but personally I would just add more and angle them a bit.
     
  5. seank

    seank Thread Starter

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    Problem is that the Canopy needs to come off and the only place I have left is on the wall (mounting wise) as plenty of stuff is already happening above tank. If you guys can remember, all my lights were staggered (well sort of) and I still did not get enough light to the bottom
     
  6. Reef Maniac

    Reef Maniac MASA Contributor

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    Hi Sean,

    You're asking the wrong guy - I have 3 x 400W MH's on my 1.8m x 0.7m x 0.7m tank, so as far as I'm concerned you should be :thumbup: :thumbup:

    I'm rushing home now to collect my new camera (only a 4 hour trip...), so I will read your lights thread this evening, or tomorrow morning, and give a slightly less biased opinion after that ;)

    Hennie
     
  7. lIghty

    lIghty

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    So my 2 x 400W on my 1.4.m x 0.6 x 0.5 should be :thumbup: :whistling:
     
  8. jacquesb

    jacquesb Retired Moderator

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    If you want to evaporate ALL your tank's water in 3 days' time, lIghty. Then YES.
     
  9. lanzo

    lanzo Sponsor

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    damn:lol:

    :lol::lol:
     
  10. Reef Maniac

    Reef Maniac MASA Contributor

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    OK, Sean - answered in your original thread... hope it helps :)

    Hennie
     
  11. dendrosa

    dendrosa Member

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    Sean why not get a PAR meter? Its the only way to get an objective view of light levels you are gettng in your tank
     
  12. MikeMck

    MikeMck

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    I have seen that Pet Stop use 2 x 400w MH with 12 T5s on there hard coral system Guesstimate of 650mm deep and there corals grow and even spawn successfully. Before they sell it!

    So my opinion is go for it.
     
  13. seank

    seank Thread Starter

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    For the price of a PAR meter to basically only use it once- I'd rather spend that money on another fishing Rod:thumbup:
     
  14. viper357

    viper357 Admin MASA Contributor

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    Andrew (millepora) has a PAR meter :)

    I have also found that MH's cast shadows and do not light up the entire tank, be they 150w or 400w I think you will still have the same problem, I think the only way you are going to combat this would be to add some T5's near the front and in the middle inbetween the MH's, these should then light up most of the shadowed and dull areas in the tank.
     
  15. seank

    seank Thread Starter

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    Thanks Dean- but Speed reading again....:whistling: :

     
  16. viper357

    viper357 Admin MASA Contributor

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    Yassis Sean, I'm going to bliksem you just now :p You need to place your T5's correctly, a couple of 80w T5's in the front of the tank will provide sufficient coverage to overcome the issue of shaded/dark areas.

    Get your T5's right then you can put as many 400w MH's on as you want.
     
  17. ben lloyd

    ben lloyd

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    why dont you put coral fluorescent led lights in ,with the MH sean?
     
  18. seank

    seank Thread Starter

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    Thank you Saia... But, I still think you speedreading. I do not have space on top to run them over the breadth of the tank(from front to back), only in front, from left to right- hence the short 39w t5's, double, meaning 2, meaning side by side, meaning in pairs, meaning the 2 together will give me 78w, meaning 2 x 39w then 400w mh, 2 x 39w then 400w mh, 2 x 39w then 400w mh, 2 x 39w then mh. I'll draw a pic when I have more time....lol
     
  19. seank

    seank Thread Starter

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    Dunno those lights Ben.. Please elaborate
     
  20. viper357

    viper357 Admin MASA Contributor

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    Well then why don't you shine lights through the sides of the tank?
     
  21. seank

    seank Thread Starter

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    :lol::lol:
    Sorry, I meant on top, towards the front
     
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