T5 vs. MH

Discussion in 'Lighting' started by Warr7207, 4 May 2008.

  1. Warr7207

    Warr7207

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    What is the difference between a 10000K T5 and metal halide of the same Kelvin rating, other than the obvious power rating difference and globe type?
     
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  3. gaz19

    gaz19

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    mh can penetrate deeper.
    mh give of more heat.
    a t5 globe would cover more area than a mh, well that depends how high the mh is.

    thats all i can come up with. maybe the one looses its par quicker?
    hence t5's get replaced soon than mh globes?
     
  4. trad

    trad Fish, thats the word!

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    May not give the same colour depending on ballast of MH, PAR rating on MH should be much higher. Think time to replace MH globe is extended to that of T5. PLus you just need a lot more T5s.


    (EDITED: Gaz beats me again.)
     
  5. Warr7207

    Warr7207 Thread Starter

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    Ok, so if I have SPS at 200mm below the lights what difference would there be between the the T5 and MH, regarding coral health and growth ?
     
  6. Warr7207

    Warr7207 Thread Starter

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    Ok lets say both techs are actually the same 10000K rating, what is the difference to an SPS corsal 200mm away from either lighting tech ?
     
  7. gaz19

    gaz19

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    that i have no clue, sorry but maybe some of the gurus can step in here

    trad you to slow today:p
     
  8. lanzo

    lanzo Sponsor

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    still waiting on the gurus:)
     
  9. Warr7207

    Warr7207 Thread Starter

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    Bump - Gurus
     
  10. viper357

    viper357 Admin MASA Contributor

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    You called. How can I help you?









    :razz::razz::razz:
     
  11. Warr7207

    Warr7207 Thread Starter

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  12. viper357

    viper357 Admin MASA Contributor

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    Good old Iwan - he's been a legend for a couple of years. Unlike our local Ivan :p
     
  13. Warr7207

    Warr7207 Thread Starter

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    Where is Sanjay Joshi ?

    Need his input on this question
     
  14. Warr7207

    Warr7207 Thread Starter

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    Does Ivan only run T5's ?
     
  15. viper357

    viper357 Admin MASA Contributor

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    I'll send him an email now, BTW he is already a member here :biggrin:

    No he's got a MH or two I think.
     
  16. gaz19

    gaz19

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    last time i checked 5. 3 150 and 2 250
     
  17. viper357

    viper357 Admin MASA Contributor

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    Almost 1KW of lighting. Nice to see he's doing his bit to help out our national electricity crisis.
     
  18. sunburst

    sunburst

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    I am no guru. Not by a long shot. But in laymen s terms we also have a measure of the energy of light ie photon ....Can be seen as a packet of energy/light. There are a few other reference to light measurement. Color spectrum is only one part. PAR (photosynthetic available radiation) is the critical one... as photosynthesis occurs in a very specific wavelength. This measurement takes into account the energy aspect as well and is easy to understand.

    I have tried to read Sanjay Joshi s threads (the supreme lighting guru), but i am frequently left bogged down with technical bits and bobs; so normally just skip to the conclusions.

    So in conclusion. A candle has a Kelvin rating of around 600k. Two candles will still have a Kelvin rating of 600K and so will a 100 candles. But the energy radiated will increase incrementally.
    And so the difference between T5 and halide can be easily seen.

    SPS have evolved in high energy zones. Shallow surf areas, heaps of light + oxygen and massive turbulence.

    I am a supporter of T5 Lighting but for sps....Hmmmmm...... there is a gap in my education
     
  19. Warr7207

    Warr7207 Thread Starter

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    I have also tried to read through these technical threads. The real difference they seem to agree on is when 20000K MH are used, but it seems undecided which is better in the 10000K options.

    Also interesting how quite a few corals propagated under the different options all look very similar once lit up under 20000K lights.

    Another interesting topic is how corals colour up to actually protect themselves from huge amounts of radiation (20000K)

    Quite ironic the more beautiful they look the more under attack the coral is.

    I am seeing more and more beautiful reefs (online) being sustained under T5's, this is the reason for my questioning the 10000K MH's.
     
  20. IMarine

    IMarine

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    They say the best sps is grown under ati t5s
     
  21. sunburst

    sunburst

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    Would love to investigate further. Could save us a lot of dosh if some one let the cat out the bag.
     
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