05-05-2010, 12:36 PM
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Joe, the tube in the first link (in post #12) I would not recommend; it is a purplish hue and weaker.
The tubes in the second link (post #15): Cool white means a crisper white, slightly more blue than red in the colour mix. Warm white is the opposite, slightly more red/yellow. "White" may be any one of a few things, but should be in between the cool and warm. But before I bought one, i would want to know the Kelvin rating and/or see the spectrum graph. The Kelvin is the "colour" of light. The sun at mid-day is approximately 5700K, so a full spectrum or daylight tube would be around 6000K. A higher K number indicates progressively more blue and less red, so a cooler white; a lower K number indicates slightly more red and less blue, so a warmer white. However, the number alone is not always reliable, since manufacturers can alter the colours.
Another question though, if you have two tubes in the fixture now, can you remove one of them and still have the other light? As I said before, the two tubes you have, assuming they are what I previously thought they were, are probably good, it is just a lot of light. Replacing the tubes if both have to be lit may not be necessary; but if you can use only one of them (some fixtures are wired this way), it would work.