Kelvin Rating

Discussion in 'Lighting' started by OCELLARIS, 11 Sep 2008.

  1. OCELLARIS

    OCELLARIS

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    hi guys could you please supply a list of globes, tubes,LED's ect that give
    of a Kelvin Rate-ing of 6500 and above, how many Kelvins would normal 50w down lighters be? how many Kelvins would an Osram 11w energy saver be?
    also need to know from a lumenous of 2850 how many Kelvins whould this be and what are TLD tubes? ;)
     
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  3. Shaun

    Shaun Retired Moderator

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    Their is no real norm, daylight are usually 6500K, not many guys state the K on bulbs.
     
  4. OCELLARIS

    OCELLARIS Thread Starter

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    thats very true thalion as ive been browsing at bulbs and stuff and there is no rate-ing on them, so if daylight is 6500k would it be ok to state that any bulb ect that produces 6500K and above would be good for corals, not excellent but good... ???
     
  5. Shaun

    Shaun Retired Moderator

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    They say 6500k = sunlight. Just remember they don't have the "power" to penetrate the water and give enough light to corals. So no not all lights are suitable for the tank. The cheep lights may also not produce the 6500k for long and my vary with age.
    6500k can also be very yellow.
     
  6. OCELLARIS

    OCELLARIS Thread Starter

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    emmmm ... maks sense, so in sayng cheap lights vary in Kelvin rating over time them what would be an okay to good make in lighting,is there a ratio as to the depth of your tank to the Kelvin rate-ing like for ???? cm then ???? Kelvins would be required?
     
  7. Shaun

    Shaun Retired Moderator

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    They all change that is Y we should change T5'd regularly, just the cheep ones are a unknown factor.
     
  8. OCELLARIS

    OCELLARIS Thread Starter

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    how often do you change your t5's ?
     
  9. Andreas

    Andreas

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    it's not the actual Kelvin rating but the PAR rating of the bulb that would penetrate if I understand correctly
     
  10. Andreas

    Andreas

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    it would depend on the amount of hours that you run the bulbs for
     
  11. OCELLARIS

    OCELLARIS Thread Starter

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    is there an hour ratinging on t5's like how certain energy savers state 5000 hrs / 8000hrs ect, ok andreas then would i be correct in saying that i could get lighting with a 6500K rate-ing with a high PAR and it be ok for certain corals, would i also be correct in saying that the higher your Kelvin rate-ing the whiter your light will be like 10000K is white and 20000K be actinic(blue)
     
  12. Zookeeper

    Zookeeper

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    I have seen a general trend that as the Kelvin rating goes up the PAR rating goes down.The result is that while a 6500k lamp would make your water look yellow the hight PAR output would result in very good coral growth.That is why many people end up running supplementry T5 actinic type tubes to get that nice crisp white colour.Even 10 000 k lamps can look a bit yellow on there own.
     
  13. Bob the (reef)builder

    Bob the (reef)builder

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    You will generally battle to find even a 6500k bulb at your average electrical outlet. The reason is that for normal usage people prefer a 2-4500kelvin rating. Even cool-white bulbs and NDL bulbs are on the warm side of what we can use.

    When I first started I used NDL metal halides with true actinic philips bulbs, and that was satisfactory, but we would probably think it was horrible compared to what we can get today.
     
  14. Zookeeper

    Zookeeper

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    Shopright & Checkers sell there own house brand of energy savers [lumex] and the do have 6500k lamps.Just check because they also have ones rated 2000k I have used them on my refugium befor but they are yellow.
     
  15. OCELLARIS

    OCELLARIS Thread Starter

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    guys what about down lighting bulbs that are 50watts do they stand a chance
    or do they give off a yellow too? they give off alot of heat so maybe the aid of an heater can be eliminated:)
     
  16. Zookeeper

    Zookeeper

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    Try e-mail Eurolux ,Osram and the other suppliers they will have the specs even if its not printed on the box or lamp.
     
  17. lIghty

    lIghty

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    M2c

    Kelvin rating it the colour of the light in the colour spectrum, lower kelvin is the red/orange colours whereas higher kelvin srteches from white, about 10000k, onto the blue side at about 18000K and up. Lumens if the brightness of the light, there is no relationship between the two.
     
  18. OCELLARIS

    OCELLARIS Thread Starter

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    will do zookeeper ;)
     
  19. Zookeeper

    Zookeeper

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    The relationship may relate to the design and type of lamp used.Metal Halides almost always produce a lower PAR output as the K rating increases.Just have a look at the specs the BLV range of lamps.
     
  20. lIghty

    lIghty

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    Stand to be corrected, but that would be the "characteristics" of the said lamp, not a mathematical relationship.
     
  21. OCELLARIS

    OCELLARIS Thread Starter

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    so coral thrive of the light so the more penatration the better, so which
    tubes are ideal, t5s? what would the lowestoption be or the cheapest option be?
     
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