Attention t5 users.

Discussion in 'Lighting' started by aslam, 2 Mar 2010.

  1. aslam

    aslam

    Joined:
    24 Nov 2007
    Posts:
    671
    Likes Received:
    7
    Location:
    Pmb
    Hello guys,I would like to clarify whether burning t5's without cooling them will shorten their lifespan.Your experiences and opinions would be appreciated.Thank's.
     
  2. AdS Guest




    to hide all adverts.
  3. viper357

    viper357 Admin MASA Contributor

    Joined:
    4 May 2007
    Posts:
    27,990
    Likes Received:
    782
    Read this, not sure what it means though :p

    http://en.wikipedia.org/wiki/Fluorescent_lamp#Effect_of_temperature
     
  4. aslam

    aslam Thread Starter

    Joined:
    24 Nov 2007
    Posts:
    671
    Likes Received:
    7
    Location:
    Pmb
    Thank's alot Viper,that confirms.Just a quick question,the t5's we use in South Africa,are these normal tubes or vho.Examples of these tubes being Ati,or Reeftek.Also,does it really matter what ballast is used regarding vho tubes.
     
  5. jacquesb

    jacquesb Retired Moderator

    Joined:
    29 May 2007
    Posts:
    17,868
    Likes Received:
    69
    Location:
    Cape Town
    Aslam - our T5's are HO only - not VHO....... The T12 Philips globes that you get here and there - are VHO's....
     
  6. Singularity

    Singularity Hmmm amper!

    Joined:
    3 Apr 2008
    Posts:
    2,496
    Likes Received:
    32
    Location:
    Potch/Centurion/Brooklyn
    hi aslam, i believe the white tubes you got from me is vho and the ballast aswell
     
  7. aslam

    aslam Thread Starter

    Joined:
    24 Nov 2007
    Posts:
    671
    Likes Received:
    7
    Location:
    Pmb
    No worries Chris,and thanks again.Thanks Jaques for confirming.
     
  8. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    Sorry for going off topic, but, how many of you guys noticed, that as the T5's get hot (i mean after a few hours) they are not as bright as compared to what they were when they were switched on? By the way, im talking about bulbs not being cooled by fans etc...
     
  9. aslam

    aslam Thread Starter

    Joined:
    24 Nov 2007
    Posts:
    671
    Likes Received:
    7
    Location:
    Pmb
    Hello Mekaeel,I also noticed this,it looks almost faded.Which bulbs in particular have you experienced this with.
     
  10. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    Not too sure of the brand now... I got it from Marco. Apparently it is made in a very reputable factory. But I had the same issue with Geisiman aswell as Aquamedic. Im planning on installing some fans soon.
     
  11. Singularity

    Singularity Hmmm amper!

    Joined:
    3 Apr 2008
    Posts:
    2,496
    Likes Received:
    32
    Location:
    Potch/Centurion/Brooklyn
    oops, yes, those you got from me is just HO not VHO
     
  12. aslam

    aslam Thread Starter

    Joined:
    24 Nov 2007
    Posts:
    671
    Likes Received:
    7
    Location:
    Pmb
    Cool Chris.Mekaeel,I have noticed this with Reeftek,Osram and Sylvania.Fans keep the water cool but the bulbs look the same after hours of use.
     
  13. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    Aslam, did you try facing the fans towards the bulbs? Thats what I am planning on doing.
     
  14. aslam

    aslam Thread Starter

    Joined:
    24 Nov 2007
    Posts:
    671
    Likes Received:
    7
    Location:
    Pmb
    I used a 12 inch fan,resting on a brace blowing directly on the reflectors.Keeps the reflectors and the bulbs cool.The t5's are diy,basically 6 54watt tubes under 4 reflectors resting on the tank braces.Tank has no hood.
     
  15. TonyDD

    TonyDD

    Joined:
    30 Nov 2009
    Posts:
    76
    Likes Received:
    5
    Location:
    U.K
    Giesemann have studied this in some detail, please find a link to the test chart here:
    http://www.theaquariumsolution.com/optimum-temperature-t5-tubes

    It would seem the optimum ambient temperature is around 35c, to me at least this relates to the temperature inside the light unit rather than the temperature of the lamp itself. I dont think active cooling is essential as long as the light unit has been designed to run within these temps.

    Active cooling is good but i would always worry about warm moist air from the aquarium effecting the ballasts if built into the unit if air is being fanned into an enclosed unit.

    Hope this helps Tony
     
    Last edited: 2 Mar 2010
  16. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    Cool. Thanks Tony. :)
     
  17. clinton stanford

    clinton stanford

    Joined:
    11 Mar 2009
    Posts:
    2,210
    Likes Received:
    4
    Location:
    East London
    mmm....very interesting.im going to be using T5's 6 x 54w.the thing is that they will be housed in 3 reflectors.2 x globes per reflector and the globes will be qiute close to eachother:whistling: do you think that will be a problem? its a DIY unit wich is being build out of chromodeck the same stuff wich they make other light units out of.there will be fans in but only over the top to keep the balsasts cool.
     
  18. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    Clinton, is it the reflectors that are meant to house two bulbs per reflector? If so, I cant see any problems.
     
  19. aslam

    aslam Thread Starter

    Joined:
    24 Nov 2007
    Posts:
    671
    Likes Received:
    7
    Location:
    Pmb
    Thanks Tony,Mekaeel,I doubt your light unit runs at or lower than 35 degrees in our hot summers especially when running all bulbs for nine hours plus.
     
  20. aslam

    aslam Thread Starter

    Joined:
    24 Nov 2007
    Posts:
    671
    Likes Received:
    7
    Location:
    Pmb
    Hello Clinton,where are you sourcing the chromadek from.You can check out the Ati powermodules and check where the fans are placed.I know a guy was building a t5 light unit on zeovit based on the powermodules.
     
  21. Nemos Janitor

    Nemos Janitor

    Joined:
    7 Feb 2009
    Posts:
    8,384
    Likes Received:
    286
    Location:
    Joe's Mountain
    @aslam what is the ambient temperature above your tank? More than 35c?


    @clinton stanford you must keep T5 tube at least 46mm c2c apart. pref with a reflector between. Closer together and you burn the tubes due to overheating. The reflector not only improves the efficiency of the tube but also its longevity.


    A little tech info here.
    http://www.sfiligoi.it/files/media/CATALOGHI%20INGLESE/STEALTH%20ING.pdf

    Giesemann used to have simmilar tech info at one time.

    @TonyDD not sure if i am correct but running temps of the old D+D globes was 82c with a life span of 15 months (4000 hours) if i rem correct. You guys and giesemann have changed you sites and i dont seem to find this info anymore.
     
    Last edited: 3 Mar 2010
Recent Posts

Loading...
Similar Threads - Attention users Forum Date
Attention led users Lighting 31 Jul 2014
MAC Users Attention Vertex Aquaristik 15 Oct 2013
Attention Torch Users. Technology 14 Jan 2011
Attention Vertex Skimmer Owners Protein Skimmers, Mechanical Filtration 1 Sep 2016
attention durban reefers General Discussions and Advice 10 Dec 2014
Attention all Bloemfontein reefers - your thoughts please Local Reefing Clubs 19 Feb 2012
ATTENTION: Terrible news.... General Discussions and Advice 6 Jul 2011