Metal Halide

Discussion in 'Equipment / DIY / Reviews' started by Buddy, Apr 1, 2018.

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  1. Buddy

    Buddy Member

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    Hey guys. I have been thinking lately about replacing my Cree LED lighting which has had a few different forms over the last 5-6 years. It is currently 2x 150mm heatsinks with approx 12-14 LEDs each in various 3w colours.
    A few of the LEDs have died (mainly the UV) and I just think it is time for something different.

    I put my energy cost meter on my LEDs and it is drawing 310w at 100% and about 100w during sunrise/sunset. Seems like a lot for such a small light.

    Anyways I was thinking of swapping to a 250w metal halide but I need advice as I have never used one.
    Tank size is Cade HL800 800(L) x 600 (W) x 550 (H)

    I do like a sightly bluer light so would 14k or 20k be better? Which pendant/globe/ballast to use? What should I be paying?
    Do they dim or just on/off? I will make a small LED with my typhon for sunrise/sunset anyway. I am also happy saving some money going second hand if that(keeping cost down is preferred!)

    When it comes to livestock, will a 250w light on this tank size give me the options for sps and clams?
    I have had a Magnifica anemone under my LEDs for the past couple of years an it seems happy but I wouldn't say its thriving.

    I don't think heat will be an issue as I will be running evap cooling anyway.
  2. Sam Parker

    Sam Parker Moderator

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    250w single ended radium 20k bulb would be the go. Magnetic ballast and a basic pendulum would be sweet.

    I have a couple spare here (complete combos) if you wanted to try it out or make me an offer :)

    Sam
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  3. Buddy

    Buddy Member

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    PM sent!
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  4. macca_75

    macca_75 Member

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    Halides are great but don't dim very well from memory. Slow start up times, but I don't think this matters. Also, off is instant so you will need the LED's on before lights out.

    I always went for a 12k - 14k bulb. I found the 20K a little to blue for me, however it's a personal thing.
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  5. Sam Parker

    Sam Parker Moderator

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    They don’t dim at all. Take about 5-10mins to warm up and do switch off completely.

    Normally I’d say 20k is way too blue, but I don’t think the radiums are actually that colour, more like a 16-17k to my eye
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  6. Buddy

    Buddy Member

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    I will probably just make a string of blue and white LEDs on a little heatsink and plug it in to my typhon controller and that will be good enough for sunrise and sunset.
    I don't mind a bluer look but I can always swap out the globe if its too much.
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  7. RobbieMVFC

    RobbieMVFC Member

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    I am sure that I will be out numbered here , But I love my Giesemann infiniti , it has 2x250 MH + 4 t5s.
    I have added some led for moon light.
    The MH are double ended witch is against the grain however I love these globes
    .
    https://www.aquariumproducts.com.au/catalogue_products.php?prodID=5817&catID=66

    While these globes are more expensive they have a 2.5 year life span apposed to 9 months
    (correct me if I am wrong on the life span of other globes)
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  8. RobbieMVFC

    RobbieMVFC Member

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    correction , according to this site its 3 years ... depends on how long you run them I guess

    https://premiumaquatics.com/products/175-giesemann-megachrome-crystal-150-watt-de-halide-bulb.html
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  9. Buddy

    Buddy Member

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    Those look great and I would LOVE a light like that but its so far beyond my budget that I can't even consider it unfortunately.
  10. RobbieMVFC

    RobbieMVFC Member

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    If you spend the money you can grow sps frags on the sand bed to help fund it.
    PS. I purchased my light second hand....[

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    Last edited: Apr 4, 2018

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