MH Over Brace

Discussion in 'Lighting' started by Reaper, 24 Nov 2007.

  1. Reaper

    Reaper

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    Hey guys,

    I've posted in a previous thread that I'm unable to use my centre halide due to it being directly over the centre brace of my tank.

    Problem's been solved today.

    I had another piece of glass lying around (almost same size as the brace). I took this glass and put it over the centre brace, about 10 cm above the brace, supported by some spacers...

    This now means the top loose piece of glass is absorbing all the heat, and the brace is even cooler than usual...

    I know this reduces the amount of light that actually hits the water, but it's a small price to pay for an extra halide on there. I personally can't see any diffusing of the light.

    Just thought I'd share this, might help someone else having the same problem.
     
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  3. Alan

    Alan Admin MASA Contributor

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    Reaper how hot did the brace used to get? I have had halides over a centre brace before with no problems, the problem comes in when the tank is acrylic as the brace melts.
     
  4. DragonReef

    DragonReef

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    Yeah I would agree with Alan. The glass should be able to withstand the heat of the MH, but if you sleeping better at night then go for the shield ;)
     
  5. Mekaeel

    Mekaeel Moderator MASA Contributor

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    how many mm is the brace Reaper?ive also got my centre halide over my brace
     
  6. Reaper

    Reaper Thread Starter

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    Alan, it wasn't a worry of the glass "melting". I've heard too many stories of the brace heating up, and when the water hits it (for whatever reason), it cracks and breaks. This was my consern also, since the tank's built from 6mm glass, as well as the brace. The brage became really hot...

    Dragon, I'm sleeping better now, thanx, hehe. Slept next to the tank last night (had to give up my room for my monster in law and my daughter - the things I'll do for my daughter...)
     
  7. Mekaeel

    Mekaeel Moderator MASA Contributor

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    i think its good that you added the extra glass.my 4ft was built from 6mm glass and the brace burst due the heat of the halide.
     
  8. Reaper

    Reaper Thread Starter

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    Mekaeel - 6mm
     
  9. Reaper

    Reaper Thread Starter

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    Oh, did your tank also pop when the brace went kabloey?
     
  10. Mekaeel

    Mekaeel Moderator MASA Contributor

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    no luckily it was just the brace
     
  11. Tridan

    Tridan

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    Cool dude I am glad you sorted this out. Got something for you will give you a ring during the week.
     
  12. Reaper

    Reaper Thread Starter

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    Thanx Tridan, will see you tomorrow.
     
  13. Tridan

    Tridan

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    No wories mate.
     
  14. Mike

    Mike Retired Moderator

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    Can you not put braces either side of the MH light, so that the light is let in to the tank, i've seen it done and it works very well, just put in two braces either side of the light spill and once cured remove the central brace.
     
  15. Alan

    Alan Admin MASA Contributor

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    LOL, i didn't think the glass brace would melt, what height are your halides from the brace and the water?
     
  16. Reaper

    Reaper Thread Starter

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    About 200 from the brace and 220 - 230 from the water
     
  17. jacquesb

    jacquesb Retired Moderator

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    Hi Reaper - I have had glass break/burst on me before, that was below the MH lighting.... RIGHT in the beginning, when I JUST had my 2 metre the first week or so - I had a piece of glass covering my tank (at that stage I was scared of crap falling into my tank, AND of evaporation - so I had my MH ABOVE this glass plate/shield. The glass was extremely thin, though - 4mm. BUT, it was just 30 minutes, then I heard a SHATTERING noise. I just KNEW it was that glass shield. I had to fish glass pieces out of my tank for a while ;-)

    Since that experience I was FAR to scared of placing my MH's above ANY of my glass braces......

    I am too scared too that I would crack too.... ;-)

    Well - glad it worked out for you.

    DR/Alan - I was aware that you had your MH's above your centre braces too.... BUT, it MUST be the height above the brace that makes the difference. My MH's are +-4cm above the brace level, and +-15cm above my water-level (in total)....
     
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