Metal Halides

Discussion in 'Lighting' started by Mark Evans, 28 Dec 2008.

  1. Mark Evans

    Mark Evans Expert

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    6,492
    Location:
    newark notts.
  2. Luketendo

    Luketendo Member

    Messages:
    463
    Location:
    West Sussex, England
    Re: mteal halides

    The T5s are there mainly for Actinics which are used on reef aquariums to supplement the light coming from the halide.
     
  3. George Farmer

    George Farmer Founder Staff Member

    Messages:
    7,091
    Location:
    Cambridgeshire
    Re: mteal halides

    The Easy Life units look great but at that price I'd consider 2 x ADA Solar I NA 150w or even the Grand Solar.

    LEDs are a lot cheaper to run, run cooler and are waterproof. It takes a while to get used to the light they give, compared with fluorescent, as there's several point sources. These give a pleasing ripple effect that only used to be gained by metal halide. I'm not sure how using T5 with LED, like the Easy Life units, would compromise this nice ripple effect.

    T5 and halide combos are ideal for staggered photoperiods with a midday burst of light i.e. use the T5 for the entire photoperiod, with a few hours of MH during the middle of the photoperiod.

    Also consider the Giesemann Infinity units MH and T5 units - http://www.giesemann.co.uk/infinity.htm

    If you only want to run the light required then 2 x T5 is plenty for most set ups. Halide is an expensive luxury (both outlay and running cost) but as you've seen at TGM - it's very nice...
     
  4. fishgeek

    fishgeek Member

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    117
    Location:
    west sussex
  5. scottturnbull

    scottturnbull Member

    Messages:
    132
    The LEDs on the Easy Life Paradiso seem to be there for aesthetic purposes. If you look at the brochure, the LEDs produce some amazing, deep-water style effects. It looks impressive, but so is the cost. When you add the price of the controller and lamps, it comes in around £1000.

    As for Halides, I think the T5s are meant to extend the photoperiod. The Arcadia Series 4 comes with 2 x 150W Halides. I've used a 250W HPS lamp for growing lettuces and herbs. It covered an area 2m x 2m, and had to be suspended high above the plants to prevent burning. HPS and Metal Halides are very similar. With an aquarium, you would probably use the T5s from morning till noon, and from afternoon till evening, saving the Halides for a short noon-day burst.

    I haven't tried Halides with an aquarium, but I once tried growing aquatic plants in a container under HPS lamps, and managed to grow long, flowing tendrils of green hair algae. But that was using a 16hour photoperiod.

    To summarise: the Paradiso looks impressive, but the expense seems mainly due to its programmability, and the aesthetics it produces. The LEDs are concentrated in the middle.
    My instincts tell me - rightly or wrongly - that T5s are included with Halides because 150-300W of light might be too much to use all day long. But that'll probably depend on the size of the tank.
     
  6. Mark Evans

    Mark Evans Expert

    Messages:
    6,492
    Location:
    newark notts.
    thanks guys. all the info i need. i'll have to mull over it all and digest some of the above information.
     

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