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Colour Temp
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uLtRa
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Joined: 11 Apr 2003
Location: Southend, UK

PostPosted: 2005.04.28(Thu)6:29    Post subject: Colour Temp Reply with quote

Just a quick one, I received my new CF overtank luminaire today. I ordered 2 36W Cf tubes lamps with it which were supposed to be a Planted tank one and a normal daylight one. Their colour temps are 8000K/12000K(pink and blue) and 7100K/8000K(white and pink). Is the pink/blue one the daylight lamp? Are these colour temps in a good range for plants? I'm no colour temp expert at all as you might guess!
I'm unsure about the blue one as it looks a lot like actinic and I'm not too confident on how well it will help the plants. Anyone think I should get new lamps?
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Alexperez
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Joined: 25 May 2004

PostPosted: 2005.04.28(Thu)7:32    Post subject: Reply with quote

Plants will grow well under a wide range of K ratings. The actinic are the ones that have no value for a plantted tank, but are used mostly for reefs tanks. You should pick the bulbs based on how you like the tank to look.
I have one tank with 9325K and the red really stand out.
The other has 6700K and the greens are really strong.
Most folks will use a mix of K ratings tio acheive a nice balance.
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Marcos Avila
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Joined: 05 Feb 2003
Location: Hiroshima (JP)

PostPosted: 2005.04.28(Thu)8:06    Post subject: Reply with quote

Color Temperature is a pretty non-trivial concept, and even less trivial is the actual effect that it has in aquarium plant growth. It only makes sense to designate a Color Temperature to a bulb if it is really trying to imitate the natural blackbody radiation emission spectrum of an object at a given temperature. That's why there's another parameter known as Color Rendering Index (CRI) that measures just how faithfully the bulb is making us view the "actual colors" of an object, that is, the colors you'd perceive if the object was being lit by natural sunlight. A true Daylight spectrum bulb should have Color Temperature around 5000-6500 K (the Sun's surface temperature is about 5800 K) and CRI of 85-90 or better in the scale of 0-100.

From your description it seems none of those bulbs are true daylights, but as mentioned that doesn't mean there's anything wrong with them...if you like the aspect they give to your tanks/fish and the plants are growing OK I don't see any reason to change them.
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