Best Light for Corals - forget aesthetics

Discussion in 'Lighting' started by Norman_the_fish, 24 May 2010.

  1. Norman_the_fish

    Norman_the_fish

    Joined:
    1 Dec 2008
    Posts:
    31
    Likes Received:
    0
    Location:
    Cape Town
    Hi All,

    I am somewhat confused by all the information out there on lighting, from 10K to Halides etc.. my question is, if you just wanted to grow your corals, not worried if your tank looks pee yellow or sc fi blue, what K-rating would be the best for your corals, i'm gonna take a guess that it would be closer to the pee yellow colour of 6000K? If so would, frag tanks could work quite well with CF (6400K) often for sale in hardware stores for less than R70?

    Thanks,
    N
     
  2. AdS Guest




    to hide all adverts.
  3. ziyaadb

    ziyaadb

    Joined:
    18 Jul 2007
    Posts:
    5,566
    Likes Received:
    48
    Location:
    JHB-Lenzz
    yes 6400K will be the best for just growth. we use the 8800K osrams and supplement with Blue and actinic awesome growth and looks
     
  4. Manic

    Manic Moderator

    Joined:
    12 Mar 2009
    Posts:
    3,313
    Likes Received:
    58
    Location:
    Johannesburg, Edenvale
    It really depends on the coral you are trying to grow. For sps you will get better growth from the 6500K globes, I posted some pics of the growth of sps under 6500K MH, where as most soft corals grow better under actinic lighting. It really depends on the depth of the coral in its natural habitat.
     
  5. neil.h

    neil.h

    Joined:
    9 Apr 2010
    Posts:
    344
    Likes Received:
    1
    Location:
    JHB
    Anybody running 6500k T5 tubes on their DT? Thinking of mixing 3 with 3 Skywhites and 2 actinics for Softies, Zoas and easier LPS's
     
  6. ziyaadb

    ziyaadb

    Joined:
    18 Jul 2007
    Posts:
    5,566
    Likes Received:
    48
    Location:
    JHB-Lenzz
    It will be very very yellow but promoth awesome growth
     
  7. neil.h

    neil.h

    Joined:
    9 Apr 2010
    Posts:
    344
    Likes Received:
    1
    Location:
    JHB
    Coming from bathwater, that won't be an issue ;) Growth is what i'm after
     
  8. Jaco Schoeman

    Jaco Schoeman MASA Contributor

    Joined:
    22 Dec 2008
    Posts:
    2,241
    Likes Received:
    48
    Location:
    JHB
    Hi Norman the fish... This is not just a simple "lower k is for better growth..." It is much more complicated. Let my complicate it a bit more for you... ;)

    Saltwater absorbes most red frequency light, thus blue spectrum penetrates much further into the water. 6400K is very far from blue...

    Read the following thread and keep it in mind. Lower K does promote growth yes, but only to a certain small extent... You will need blue too...

    http://www.marineaquariumsa.com/showthread.php?t=15099
     
  9. Jaco Schoeman

    Jaco Schoeman MASA Contributor

    Joined:
    22 Dec 2008
    Posts:
    2,241
    Likes Received:
    48
    Location:
    JHB
    Oh, and also... Lower K ratings allow for much better algae growth too... Hence the reason I use 3000K on my ATS.

    Be careful not to just go with as lowe K as possible. IMO, get yourself Geisemann Aquablue + T5's. They are balanced nicely.
     
  10. Norman_the_fish

    Norman_the_fish Thread Starter

    Joined:
    1 Dec 2008
    Posts:
    31
    Likes Received:
    0
    Location:
    Cape Town
    thanks Jaco for the info and further complicating matters..hehe.. i'm primarily lookin at softies and mayb LPS, hoping to create a very low tank with 'cheaper' lighting options such as CF rated at 6400K to hopefully bump up the growth.
     
  11. Jaco Schoeman

    Jaco Schoeman MASA Contributor

    Joined:
    22 Dec 2008
    Posts:
    2,241
    Likes Received:
    48
    Location:
    JHB
    Norman, let us take mushrooms as an example.

    Brown mushrooms are generally shallow water mushrooms, as the algae inside adapts to the heavy amounts of red light it receives.
    Blue and green mushrooms are deeper, where it gets blue spectrum light.

    Thus you can not just keep both colors in one tank hoping they all do the same. You might actually tweak the color of the blues to turn brown...

    Bright colored zoa's are from shallow waters, where greens and blues come from deeper water in the same way.

    Make sense? That is why it's best to cater for both. Also, the light output (lumens per watt) is not really enough to feed the frags as MH or T5 or even sunlight would... ANother drawback to using CFL's on corals.

    They can work yes, but you might get better and faster grwoth from more intense lights like MH or T5.
     
  12. Dane

    Dane

    Joined:
    24 Jan 2010
    Posts:
    1,717
    Likes Received:
    42
    Location:
    Fregate Island, Seychelles
    I use two cheap energy-saver 6500k CFL globes balanced with two actinic T8s on my little nano and everything is doing fine, even my frogspawn. Will probably add another CFL or two tho. I could never run the tank without actinics... it looks awful! I think CFLs are a bit underated for growth tho... Check my tank in my sig if you're interested - although that thread is in dire need of an update!!
     
  13. Manic

    Manic Moderator

    Joined:
    12 Mar 2009
    Posts:
    3,313
    Likes Received:
    58
    Location:
    Johannesburg, Edenvale
    Just be careful with judging the frog spawn by extension. The more a frog spawn is extended just shows that it is searching for light. Over extension of lps corals often leads to death in the long run.
     
    Dane likes this.
  14. Nemos Janitor

    Nemos Janitor

    Joined:
    7 Feb 2009
    Posts:
    8,384
    Likes Received:
    286
    Location:
    Joe's Mountain
    What is the Expected PAR at coral depth?
     
  15. Dane

    Dane

    Joined:
    24 Jan 2010
    Posts:
    1,717
    Likes Received:
    42
    Location:
    Fregate Island, Seychelles
    Eeek! Dont say that about my frogspawn!!! It doesnt look like its overextending... just looking nice and open. Thats it, putting the third CFL on tonight!!!

    ;-) thanks for the advice!
     
Recent Posts

Loading...
Similar Threads - Best Light Corals Forum Date
best lighting for corals General Coral Care 7 Oct 2009
Best Eco lighting solution Lighting 5 Apr 2016
Zoa Craze - Best Lighting Soft Corals 6 Sep 2014
PL Compact Flourescent Lighting! best tubes? Lighting 11 Aug 2014
best lighting for this coral LPS Corals 4 Oct 2013
Best way to explain and understand lighting Lighting 9 Nov 2010
Whats the best Lights??? General Discussions and Advice 21 Jul 2009