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Thread: How often should Metal Halide bulbs be replaced?

  1. #9

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    Hi,

    the efficiency of modern MH lamps and fluorescent lamps is very similar, so 400W MH lamps should have a similar effect to the plants as 400W fluorescent tubes. The spectral distribution of the MH-light is much broader and the colours are better due to this.

    From the pictures of Josh's plants I would guess the new MH lamp with a colour temperature of 5500k will yield harder plants. I. e. I discussed the picture of N. ephippiata Joash posted some months ago with a friend and we both agreed, that the plant didn't looked like growing under 400W MH lamps - maybe this is an efect of the spectral distribution of the old lamp.

    I won't expect too much damage from the new lamp, Nepenthes are quite hard. The light levels might be measured using the photo sensor of a camera. In case they are very big a slight shading can not hurt. Under my conditions even the soft plants from Andreas adjust to very high light levels in about three weeks time. OK, the new groth is much smaller after this procedure.

    Cheers Joachim

  2. #10
    swords's Avatar
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    Joachim, the N. ephippiata is not under 400W of metal halide lighting (yet). It's in the highland tank which has roughly 300W of compact fluorescent lighting. This lighting is also due to be replaced but I am going to build a new H/L chamber (fusca, rajah and hamata have outgrown their welcome in this one) so I will eventually be using the second channel of the dual 400W MH ballast over the new highland chamber.

    Currently the only tank lit with the MH is the intermediate/lowland tank which houses things like N. maxima hybrids, truncata, eustachya, sanguineas, northiana (in a shadier part) and some other assorted hybrids.

  3. #11

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    The bulbs need to be changed yearly. The company that manufactured mine stated to use them longer places a risk on the ballast and it can burn out as a result. Also the spectral efficiency declines over time. The bulbs only are good for so many "lights" so avoid turning them on and off. This will wear them out sooner.

    I use a plain white plastic garbage bag, one layer thick, to cut back the light where needed, and it seems to work just fine for me.
    "Grow More, Share More"

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