Lighting (kevin and lumens)

boyosiris(z7 DC)September 3, 2005

Hi guys,

I am confused. Kevin vs Lumens? I undestand that kelvin addresses the color spectrum and lumens for just how bright the light source is. However there are a number of bulbs that only have lumens printed on the package. How can I get more info on the degree Kelvin of a bulb, or is there a conversion formula?

thanks in advance

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woeisme(z7b NC)

No conversion between the 2. Like you said Kelvin or K-rateing is color temperature. Lumens is a measurement of output based on what is seen by the human eye. Lumens isn't used,in the case of aquarium plants, as apposed to the watt per gallon method because the human eye is more responsive to the yellow and green colors of the spectrum. The yellow/green have little effect on plant growth. The blue/violet are more imporatnt along with the red/orange. I think the ratio is 2 units blue/violet to 1 red/orange. Usually bulbs that are above 5500K are marked with a K rateing. I am speculating because of the rare allergy to natural sunlight some suffer from. 5500K is approx. = to the suns spectrum at 12 noon. For the most part anything labeled cool white, soft white are below 5000K. Ones with full spectrum, or sunshine are usually

    Bookmark   September 3, 2005 at 9:42AM
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