MH Position

Discussion in 'Beginner Discussions' started by herkie, 3 Aug 2007.

  1. herkie

    herkie R.I.P.

    Joined:
    18 May 2007
    Posts:
    884
    Likes Received:
    3
    Location:
    The Bay of KZN
    I want to fit my 2 150w(10000k) halides to my new small tank tomorrow and need some help on the mh mounting position. The display is 1200x450deepx430wide. I want to start off with the halides I stay in Kwambonambi where it gets VERY hot in summer and decided not to have a closed hood in order to reduce heat transfer from the lights. There is a convenient mounting spot 180 mm from the tank top(220 from water level) Will it be ok if I cut holes to fit the lights at that height?
    Next i have 4xt8 actinics to be mounted, what should the mount height be for them?
     
  2. AdS Guest




    to hide all adverts.
  3. Reaper

    Reaper

    Joined:
    15 Jun 2007
    Posts:
    1,117
    Likes Received:
    50
    Location:
    Kuilsriver - Western Cape
    Dude, with the T8's, it's as close to the surface as you can (without any risk of possible contact, of course), and as many as possible, which will evidently constrict the space for halides.

    On the halides, I'm unfortunately unable to help you. Not too close due to heat production, but too far and there's not enough penetration - hence your predicament.
    I'd however say the 220 from the surface should do it, that's about how high I would place mine (closed canopy with fan).
     
  4. herkie

    herkie Thread Starter R.I.P.

    Joined:
    18 May 2007
    Posts:
    884
    Likes Received:
    3
    Location:
    The Bay of KZN
    Thanks Reaper, 220 also seemed ok to me. Maybe because it's convenient to me, starting to mount now. Will let you know what it looks like once I fire them up.
     
  5. Reaper

    Reaper

    Joined:
    15 Jun 2007
    Posts:
    1,117
    Likes Received:
    50
    Location:
    Kuilsriver - Western Cape
    Pics, bru. You know the rules, hehe. PICS!
     
  6. cybervic

    cybervic

    Joined:
    4 Jun 2007
    Posts:
    453
    Likes Received:
    6
    Location:
    Kimberley
    From my experience with 150mh lights I would recommend between 150mm and 200mm no further. To explain (I'm not a scientist, yet :p) At 100mm say your corals will be able to utilise +-100% of the light, just move the lamps up to 200mm and the available light will halve and only +- 50% will reach the corals.

    Now there are many better explanations out there(just google a bit) but that is the bare basics.

    One thing to remember is that MH will crack braces/glass if they are to close to them, unless the glass where hardened.

    My 2c

    Wikus
     
  7. herkie

    herkie Thread Starter R.I.P.

    Joined:
    18 May 2007
    Posts:
    884
    Likes Received:
    3
    Location:
    The Bay of KZN
    Last edited: 4 Aug 2007
  8. herkie

    herkie Thread Starter R.I.P.

    Joined:
    18 May 2007
    Posts:
    884
    Likes Received:
    3
    Location:
    The Bay of KZN
    Sorry about the photo quality next one should be better-at least got it here
     
  9. DragonReef

    DragonReef

    Joined:
    4 May 2007
    Posts:
    2,601
    Likes Received:
    2
    Location:
    Durban, ZA
    Herkie, 220mm will be fine ;)
     
  10. herkie

    herkie Thread Starter R.I.P.

    Joined:
    18 May 2007
    Posts:
    884
    Likes Received:
    3
    Location:
    The Bay of KZN
    Hi Dragon, I already mounted them 120 from the water. Do you think it is too close? What will happen if too close apart from the heating aspect?
     
  11. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    id go 200mm herkie.there are chances of the corals being burnt.im no pro at lighting lets see if someone else can confirm
     
  12. cybervic

    cybervic

    Joined:
    4 Jun 2007
    Posts:
    453
    Likes Received:
    6
    Location:
    Kimberley
    the light spread might not be what you hoped for and you have to be carefull not to burn any new corals that you introduce. My 150's are +-100mm from the water
     
  13. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    yes forgot about the light spread.
     
  14. leslie hempel

    leslie hempel Moderator MASA Contributor

    Joined:
    7 May 2007
    Posts:
    14,542
    Likes Received:
    285
    Location:
    Gonubie East London
    mine sit 250mm ..... 220mm will be fien...
     
  15. herkie

    herkie Thread Starter R.I.P.

    Joined:
    18 May 2007
    Posts:
    884
    Likes Received:
    3
    Location:
    The Bay of KZN
    I just measured the proper distance after it was fitted and it's 140. I wonder if I should take a chance as is or must I lift the lights. I will decide what to do after you all give more advice.
    Thanks a stack for all the advice.
     
  16. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    if you can raise the lights.do it.think about the long run ;)
     
  17. Reaper

    Reaper

    Joined:
    15 Jun 2007
    Posts:
    1,117
    Likes Received:
    50
    Location:
    Kuilsriver - Western Cape
    Depending on the area covered by your lights, I'd say you could raise it a little, so the light can reach more of the corners, etc. Couldn't know for sure 'till we can see pics

    Just my 2c
     
  18. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    yeah.how about the pics of the lights fitted on?
     
  19. herkie

    herkie Thread Starter R.I.P.

    Joined:
    18 May 2007
    Posts:
    884
    Likes Received:
    3
    Location:
    The Bay of KZN
    Im trying my best to getPhotobucket going, will post a photo soonest
     
  20. herkie

    herkie Thread Starter R.I.P.

    Joined:
    18 May 2007
    Posts:
    884
    Likes Received:
    3
    Location:
    The Bay of KZN
    Photobucket came to light.[​IMG]
     
    Last edited: 5 Aug 2007
  21. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    im surprised.doesnt look all that bad.the lighting looks quite dispersed!lets see what our gurus gotta say!and also judging by your overflow it should be fine in terms of water height
     
Recent Posts

Loading...
Similar Threads - Position Forum Date
Position of top up tank General Discussions and Advice 15 Dec 2014
Powerhead positioning General Discussions and Advice 7 Dec 2014
Anyone that knows of a general admin position available in Cape Town NSubs? The Sump 13 Jun 2014
Coral Positioning Beginner Discussions 4 Jun 2013
Call Centre Positions Available The Sump 13 Dec 2012
chiller positioning General Discussions and Advice 24 Jan 2011
Anenome positioning Beginner Discussions 6 Sep 2010