User Tag List

Informational! Informational!:  0
Likes Likes:  0
Page 1 of 2 12 LastLast
Results 1 to 8 of 14

Thread: Metal halide - 10,000 k for corals

  1. #1
    MadAboutCPs's Avatar
    Join Date
    Apr 2004
    Location
    Australia
    Posts
    232
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi,

    I have a 10,000k Metal Halide lamp and ballist that was used on a Marine tank for corals. I am wondering if this is suitable to use to grow Nepenthes in a lowland tank. How far should these lamps be from the plants because I didn't get a manual for it and it was custom made. And I don't want to burn the plants.

    I am also using fluorescent tubes such as powerglo and I have seen the aqualux fluorescent tubes and they have 10,000k written on the packet and claims to promote growth for plants and corals as opposed to a grolux fluorescent tube that says it promotes photosynthesis. Which is the best to use and what is the exact spectrum (in nanometres) that Nepenthes require to grow efficiently?

    Thanks,
    Christian

  2. #2

    Join Date
    Apr 2003
    Location
    Central Coast, NSW, Australia
    Posts
    792
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    HI mad about cp's.

    I use 2 18,000K for my tanks. that will give them enough light.

    Gus

  3. #3
    swords's Avatar
    Join Date
    Apr 2002
    Location
    Cernunnos Woods
    Posts
    8,120
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi Christian,
    I put a 10,000K metal halide over my chamber and it looked pretty dim-not very intense-very blue. So I changed it out for a 6500K which is a far whiter light. I'm not saying it won't work, it's just designed more for corals who specialize in using the blue wavelength.

    Tropical sunlight is 5000K and 100 Color Rating index (all the wavelengths). The Chroma 50s by GE almost exactly simulate tropical sunlight but I find them a bit too golden for my taste. Sun at the level of Chicago IL is 6500K is a a crisp white color. I use the "Daylight" 6500K bulbs, a twin tube pack at wal mart is about $9.25 compared to about $20 per tube at an aquarium shop for the same thing. You know you'll need more than the one tube right? I have six tubes over my terrariums lit by fluorescent tubes and this gives me a pretty intense lighting. I also cover the glass with tinfoil (with flip up flap on the front for looking at my plants) this lets the light bounce around "infinately" and not be lost to the rest of the room.

    Hope that helps some!

  4. #4
    MadAboutCPs's Avatar
    Join Date
    Apr 2004
    Location
    Australia
    Posts
    232
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi swords,

    Thanks for the detailed info. I gather using multiple fluorescent tubes such as growlux would be more beneficial to the plants. Is blue light required for plant growth and photosynthesis in plants and the red light for flowering?

    And would placing cut to size mirrors around the tank to reflect light be more effective than foil used in cooking?

    Christian

  5. #5
    Tony Paroubek's Avatar
    Join Date
    Oct 2001
    Location
    Far Away NY
    Posts
    4,640
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Blue light (about 420-435nm) is the range chlorophyll A functions at. So you want a good portion of your spectrum at this wavelength since chlorophyll A is the primary molecule powering photosynthesis. Plants can also absorb other wavelengths via different molecules to help suppliment photosynthesis. Red and far red light play large roles in many plant processes and the timing of them. Flowering is one of them.

    Sorry I can't help on the distance. It would depend on the bulbs output. I would deffinately start at a good distance though because switching from fluorescent tube to MH is likely to burn the plants if your not careful. Then decrease the distance over time until the proper distance is reached.

    As for the 10k bulb you can use it although 5k-6.5k is probably better rounded. You could always add a second bulb in a small fixture.. something like one of those softwhite compact fluorescent bulbs (2.1k) would add red to the balance.
    Tony
    Is that a Nepenthes in your pocket or you just happy to see me?

  6. #6
    swords's Avatar
    Join Date
    Apr 2002
    Location
    Cernunnos Woods
    Posts
    8,120
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Oh, no, don't mistake meto say use those "Gro Lux" bulbs! If you're thinking of those "plant bulbs" they sell at most home stores they are very dim as well.To me they aren't much better than trying to grow with a hippy blacklight.

    If you have a MH then most certainly use it it's the closest you can get to sunlight in your house. I just saying that I would use a different more balanced bulb. www.marinedepot.com sells MH bulbs in varying wattages and spectrums. Most are reef spectrum 10-20K but they do also sell 5000 and 6500K MH bulbs and thankfully these are also on the cheaper end of the MH bulb spectrum! I use the 400 Watt Ushio 6500K over my bathtub/showerstall intermediate (house temp) grow chamber chamber. It works excellent!

  7. #7
    homer's Avatar
    Join Date
    Mar 2003
    Location
    Puyallup, Washington USA
    Posts
    679
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Question

    Hello Christian,

    Just the other day I bought a Coralife 20,000K 40w fluorescent bulb that promotes growth for plants and corals as well. I emailed the manufacturer for more information, and found out that the CRI is 92, and total lumens is 2600. Compared to the Chroma50 which is 90 and 2250.

    The Coralife is only 1 of 4 bulbs I have powering the terrarium, so it's impact shouldn't be too dramatic.

    Anyone else using 10K or 20K bulbs out there?

    -Homer

  8. #8
    MadAboutCPs's Avatar
    Join Date
    Apr 2004
    Location
    Australia
    Posts
    232
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi tony, swords and homer,

    I am really impressed with your plant photos Tony. They really gave me some inspiration.

    And thanks for the assistance. I have been out in the garden re-arranging the greenhouse and inside getting the lighting right. I have a 68 watt metal halide lamp which is supposed to maintain medium size plants. And a powerglo fluorescent tube, a sylvania grolux fluorescent tube and a sylvania aqualux fluorescent tube. Am I giving these plants a broad spectrum or is it just overkill?

    Thanks everyone,
    Christian

Page 1 of 2 12 LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •