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Too much light/Not enough light??

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  • Too much light/Not enough light??

    Hi, currently I have (2) 250w 10k XM SE Metal Halight Bulbs operated on a Magnetic Ballest, along with (2)110w VHO Atentics. I personally think this is way way too yellow for me. I have had the MH bulbs since mabe January 2005, and one of the VHO's since then. The other VHO is a year old but I am running it anyways...dont ask why.

    Anyways, I kinda want to switch out the 10k's for 20k's next year, BUT am afraid I will lose color(I want to keep the atentic VHO's also).

    I broght some frags in to the LFS that I thought werent particularly pretty, but when put under the 400w 20k,s BAM!!!

    Those colors popped like I cant even descripe...one coral was absolutely glowing, which looks drab IMO in my aquarium.

    My tank is a 75 gallon, and I was wondering if it is possible to take out the 250 watters AND VHO's and install just (2) 400w 20k MH's only. (Electricity cant get too crazy.....)

    Anyhow, can I do this? Or will this be too much for my 75 gallon, but even too much with 20k's? Is such a thing possible? The maximum I can put these bulbs above the water level is 15"...I will put them that high when acclamating the corals in the beginning...but another question arrises...will there be a significant increase in light brightness even when switching from 250 10k's to 400 20k's? I realize that there will be some intensity increase...how much? Will rising the bulbs 15" be enough for acclimating them in the beginning or will some eggcrage need to be used?

    And also, do I need different bulb sockets for the 400w SE's or can the regular ones I have now be used?

    All I would have to change is the ballast, and ofcourse the bulbs, right?

    Last, is there anyone here who would want to trade two basically new(a few months old used) Magnetic 250w MH ballasts for two 400w SE bulb ballasts(ones that work well, ofcourse...not encrusted 1" deep with saltcreep for whatever reasons...)

    Like I said, the acro's and monties I brought in absolutely popped under the 400w 20k lighting....not sure which brand of 20k though, I will have to ask.

    Thanks...
    Proud owner of an Elegance Coral "that lived". (It is thriving whith long tentacle tips...purchased in January 2005.) It has white tentacle tips, I beleive this has something to do with ones that will typically live due to the collection site.

  • #2
    I think a 10kK 250w bulb has more PAR than a 20kK 400w bulb.

    Just keep in mind that properly colored up montis and acros will look just as stunning and more natural under white light than under blue light.
    400 gallon reef, Bubble King 300, I~Spin, 2 x 10,000K BLV 400W, 2 x 20,000K Radium 400W, 2 x 6,400K Osram 400W, Schuran Jetstream 1, AquaController Pro

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    • #3
      anyone else?

      The idea of using just (2) 400w 20k radiums over my 75 is getting to me...the more I think about it...the more I want to do it.

      Anyone here have this set-up over a 75 gallon?

      I went to Inland Aquatics today in Terra Houte, IN and they have 5500k 400watters 15" away from montipora cap's and various acros and seritopora...after seeing the intensity in that...there is no such thing as overlighting.....
      Proud owner of an Elegance Coral "that lived". (It is thriving whith long tentacle tips...purchased in January 2005.) It has white tentacle tips, I beleive this has something to do with ones that will typically live due to the collection site.

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      • #4
        I went back to 10k instead of 14k cause I lost a lot of growth. I saw and amazing amount of growth come back in the 1st week after switching back.

        -Tim

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