I bought two of these bulbs and for their price I was thoroughly disappointed in them. They glow faintly, and even in a completely dark dorm they only produce a faint, faint glow on white objects just a few feet away. The coil even glows unevenly, and some of its sections flicker faintly. If you want black light, get a 2 inch tube or something with low light output. They are useless and do not produce the desired results.
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