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Hello: In all my reading about live plants in the aquarium it seems that a k of around 6500 or so is the best. I ordered a bulb by Hagen that is sold for plants, their aquaglo, and the k is 18,000 (very blue) Is it ok, and why such a high K?? :?
Planted Tank Enthusiast
It's fine. Ignore the Kelvin ratings--they're poor indicators of a bulb's effectiveness. Intensity is the most important factor for plant growth, then spectrum. Kelvin tells you only roughly what color the bulb appears and is a matter of personal taste, though generally it's best to avoid actinic blue bulbs.
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