Why do people run 6500K bulbs?

Discussion in 'Aquarium Lighting By Dana Riddle' started by Velcro, Dec 4, 2017.

  1. Velcro

    Velcro Well-Known Member

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    I see a few SPS veterans on this board promoting 6500K bulbs for SPS growth/health. Isn't something like aquablue special much more bang for buck as far as PAR/PUR? My understanding is that all that green in the 6500K has no benefit to coral.

    6500K:
    [​IMG]

    ABS:
    [​IMG]
     
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  2. S-t-r-e-t-c-h

    S-t-r-e-t-c-h Well-Known Member R2R Supporter R2R Excellence Award

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    I vaguely remember hearing somewhere that 6500k bulbs have higher par readings than 10,000k, etc. If you're supplementing with T5 actinics, 6500k winds up with a more natural looking light. In the end, it's probably all preference...
     
  3. squareriggersailor

    squareriggersailor Well-Known Member

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    I used to run Iwasakis and VHOs years ago, like '90s years ago. I thought the 10K bulbs that were coming out at the time were too blue LOL. People still use them?
     
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  4. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter Photo of the Month Award Reef Squad R2R Excellence Award

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    We need green to see stuff well.

    Also note the B R ratio. Looks like standard reef dosages.

    If you pulled down the r y o ,it would be a higher color temp , but then blue dose would be the same.
    The dose is measured in umol.
     
  5. Velcro

    Velcro Well-Known Member

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    My Blue + and Coral+ bulbs have slightly more PAR than the 6500k when measuring with the par sensor directly on the bulb.
     
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  6. Velcro

    Velcro Well-Known Member

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    Yea, I know the green is there to see stuff well, but you can get plenty of green with ABS and coral plus bulbs.
     
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  7. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter Photo of the Month Award Reef Squad R2R Excellence Award

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    Par meters also measure for terrestrial plants. So add red y o and the par goes up on the meter.
    PUR is more relative to the specific organism.

    So I can make a high par lamp with very little blue for coral. Depending on how I mix it , it could be in the 32- 48 k range.
     
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  8. Velcro

    Velcro Well-Known Member

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    Which, I think, strengthens my point. There's a TON of green in that bulb.
     
  9. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter Photo of the Month Award Reef Squad R2R Excellence Award

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    Just a different tool. Same result.
    If I understand the question correctly.
     
  10. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter Photo of the Month Award Reef Squad R2R Excellence Award

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    Yes there is. But without it a green coral won't really look green.
    Red and blue with no green or magenta is a "pink" grow light I belive.
     
  11. S-t-r-e-t-c-h

    S-t-r-e-t-c-h Well-Known Member R2R Supporter R2R Excellence Award

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    Not saying that's what I'd do. :p Just guessing why people would recommend it...
     
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  12. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter Photo of the Month Award Reef Squad R2R Excellence Award

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    No swat , just conversation. Million ways to skin a cat.
     
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  13. Kayvon

    Kayvon Well-Known Member Build Thread Contributor

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    I saw some people recommending the Tropic. I threw one into my 8 bulb with 4 actinics and 3 blue+.
     
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  14. Velcro

    Velcro Well-Known Member

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    How's that working out for you?
     
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  15. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter Photo of the Month Award Reef Squad R2R Excellence Award

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    Diesel runs the tropic as his base color on his tanks , Then builds the spectrum peaks with blue bulbs or actinics.
     
  16. Kayvon

    Kayvon Well-Known Member Build Thread Contributor

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    It's been a week, so results are inconclusive lol
     
  17. Velcro

    Velcro Well-Known Member

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    I thought he was one of the people advocating for them. @Diesel
     
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  18. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter Photo of the Month Award Reef Squad R2R Excellence Award

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    Yup. And that controlled color mixing is why.
    Build the base and then augment for PUR.
    It's also better for visual color rendition. Reds are redder as now there is some to reflect back to you.
    It's why I run my leds warm. Around "16k"
     
  19. Velcro

    Velcro Well-Known Member

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    I'm currently running 5 blue+, 2 actinic, 1 coral+ and using kessils to adjust visual color temp.

    23915737_10105806131283282_8742030803163481812_n.jpg
     
  20. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter Photo of the Month Award Reef Squad R2R Excellence Award

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    What a sweet set up.
     
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