I used this bulb in a desk lamp to write with ink (Blue Noodle Ghost) that is only visible under UV light to get a brighter and wider illumination of the lamp, than this is possible with UV - flashlight. My intention in purchasing the bulb was to free my left hand to staple the page, not hold the flashlight. The result: The beam of a UV flashlight is vastly superior to it in all respects - in terms of beam width and beam intensity. I added a star to his overall rating because he is one of the few trying to reach the 365Β° wavelength. Three stars for its durability gives an average rating because I can't tell and being an LED bulb I can die before the bulb burns out and I can't tell its lifespan after that.
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