This is an unusual lamp for unusual applications. The lamps are designed for a minimum overall length. I would suggest measuring the maximum length that will fit in your fixture and buying the largest bulb that will fit, regardless of the recommended wattage. Come on, these lightbulbs generate almost no heat and none of them use much electricity. However, a slightly longer lamp of the same design gives off much more light. In addition, the warm white-yellow color range appears lighter than the daytime blue color range. If I had to buy another one I would look for the brightest bulb I could find that would fit. We hope all lamps like this one have the specified length from the base to the top of the lamp for the buyer to understand. This is not a criticism of this particular lamp which works well.
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