View Poll Results: was this post helpful for you?

Voters
68. You may not vote on this poll
  • yes

    59 86.76%
  • no

    9 13.24%
Page 3 of 4 FirstFirst 1234 LastLast
Results 31 to 45 of 59

Thread: kelvin rating vs colour spectrum ANSWERED!

  1. #31
    Join Date
    Dec 2008
    Location
    Oxley, Queensland
    Posts
    1,498

    Default

    great info,
    lol, i was just going to ask this question.
    But i'm abit confused. I found a 14 watt T5 triphosphor flourescent in my shed and it says cool white?
    Other features are 4000K (84 0) and brand is crompton ligthing.
    Is there anyway of finding the light spectrum since it is not on the package?
    Is my light suitable for a 6 watt moss tank?

    Thanks for the help.

    Heres a link to the light:
    http://www.cromptonlighting.com/catb...php?subcat=32#
    Last edited by bugman2494; 14-12-08 at 02:02 PM.

  2. #32
    Join Date
    Mar 2008
    Location
    NSW campsietown
    Posts
    61

    Default

    just a bit more of info/ mis-info..

    i found this somewhere on the web here

    "Other than the wattage of lights, a good lumens output is essential for a lamp used for cultivating aquatic plants. Lumens refer to
    Unit of measure for amount of light produced by a lamp once it is started. One lumen equals one foot candle per square foot. High light intensity provides more energy to the plants for photosynthesis. "
    not that i agree or not im trying to get my head around it all

  3. #33
    Join Date
    Nov 2008
    Location
    WA perth
    Posts
    80

    Default

    I just bought a light yesterday for my plants that the lady in the LFS said would be best for plants. Its a sylvania growlux. When i put it on the tank, i noticed that it is pinkish in colour. I checked the spectrum and it shows that it should be admitting 100% blue light 80% green and 70%red. But why can i only see the red. Also its an 18W. My tank is just over a foot cube. The light is a two foot and hangs over the edges but it doesnt look bright enough

    Is this because of my lame human eyes.
    Is it not bright enough.
    Does the wattage matter

  4. #34

    Default

    Elle, depending on what you're aiming to grow you would want at least 2 x18w bulbs over your cube.

    One growlux, and another around 10,000K colour temp in order to bring the overall visual colour back to 'white'.

  5. #35
    Join Date
    Apr 2009
    Location
    Melbourne, VIC
    Posts
    35

    Default

    So I actually have the right set up then for plant growth??

    One blue tube and one pink/red tube?

  6. #36
    Join Date
    Oct 2008
    Location
    Where people dump things on side of streets.
    Posts
    3,448

    Default

    Sounds good. Although it is best to have 2 red to 1 blue light ratio for plant growth.
    All I need is the air I breathe, and a place to rest my head.

    | Synchronicity | Symphony | Symposia | Synthesis | Serenity

  7. #37
    Join Date
    Apr 2009
    Location
    Melbourne, VIC
    Posts
    35

    Default

    cool. thanks for the that, I may have to upgrade my lighting to a three tube.

  8. #38

    Default

    It depends what you mean by blue tube...
    You shouldn't be using anything above a 10,000K colour spectrum for plant growth.

    To me, a "blue tube" sounds more like an 18,000K actinic tube which is meant to be for marine use...

  9. #39
    Join Date
    Apr 2009
    Location
    Melbourne, VIC
    Posts
    35

    Default

    Its a 28 watt light if that helps

  10. #40
    Join Date
    Oct 2008
    Location
    Where people dump things on side of streets.
    Posts
    3,448

    Default

    Quote Originally Posted by CraigH View Post
    It depends what you mean by blue tube...
    You shouldn't be using anything above a 10,000K colour spectrum for plant growth.

    To me, a "blue tube" sounds more like an 18,000K actinic tube which is meant to be for marine use...
    Sorry, I should be more specific. I mean 2 x tubes peak in red spectrum plus 1 x tube peak in blue spectrum.
    I am not referring to kelvin ratings. Kelvin rating is more of a guide which you choose in order to acheive your desired lighting look.
    Check this link for more information.
    Last edited by greenfinger; 06-04-09 at 03:33 PM. Reason: Link
    All I need is the air I breathe, and a place to rest my head.

    | Synchronicity | Symphony | Symposia | Synthesis | Serenity

  11. #41
    Join Date
    Apr 2009
    Location
    Melbourne, VIC
    Posts
    35

    Default

    thanks guys...I will check out that site and see what I can find

  12. #42
    Join Date
    Jan 2009
    Location
    Sydney
    Posts
    402

    Default

    Hi, thanks to all the contributors for taking the time to make it more clear.

    So if I understand all this correctly, one could use a 20,000K bulb on a planted tanks so long as the bulb emitted a spike in the red and blue parts of its spectrum?

    For instance, I have 4 x 6700K bulbs on my tank, and it looks quite yellow, so if adding one 20,000K to balance out the look wouldn't hurt, I might give it a try. If you liked the blue aquatic look (I do!), you could theoretically use entirely 20,000K bulbs if they had a desirable spectrum?

    Thanks

  13. #43

    Default

    Theoretically... but I think you will find that there won't be a 20,000K bulb on the market with a desirable spectrum for freshwater aquotic plants. Coral, yes.

    Get a 10,000K bulb if you want to try and eliminate the yellow look of your current setup.

  14. #44
    Join Date
    Oct 2008
    Location
    Where people dump things on side of streets.
    Posts
    3,448

    Default

    Quote Originally Posted by CraigH View Post
    Theoretically... but I think you will find that there won't be a 20,000K bulb on the market with a desirable spectrum for freshwater aquotic plants. Coral, yes.

    Get a 10,000K bulb if you want to try and eliminate the yellow look of your current setup.
    Yup, Craig is right. The kelvin rating is a guide only. It will look more natural and kelvin rating of around 10,000k is bright enough to balance it out for you Splat.

    20,000k have spectrum peaks that are not as beneficial for plant growth.
    Last edited by greenfinger; 08-04-09 at 03:56 PM.
    All I need is the air I breathe, and a place to rest my head.

    | Synchronicity | Symphony | Symposia | Synthesis | Serenity

  15. #45
    Join Date
    Jan 2009
    Location
    Sydney
    Posts
    402

    Default

    Thanks for clarifying that, it will help me when selecting my future lighting. Why oh why did I just give away 6 xbrand new T5HO 10,00K lights?! Fool!!

Page 3 of 4 FirstFirst 1234 LastLast

Posting Permissions

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