Let the screen of your Android smartphone or tablet shade in an ultraviolet light. Use this UV light app to simulate the color of a real blacklight. Switched on, the screen acts like it would produce true black light, but it doesn't, because this does not cover the color spectrum of real UV range. As a simulation, you can use this application with it purple animation, to have a lot of fun on parties or prank your friends. One click is enough and the simulated black light is turned on. With another, you switch off the UV lamp. The switching process is accompanied acoustically. This supports the illusion of a proper fluorescent tube. To simulate a higher brightness, a total of three light sources are shown. During use, the screen brightness is adjusted to 100 percent. After that, it will be moved back to normal, so the batterylife is protected. If you like the app, please rate it positive in Play Store. However, always keep in mind that this is explicitly marked as simulated and not real UV light with a fluorescent effect. Behalte jedoch stets im Hinterkopf, dass es sich hierbei explizit um simuliertes und keine echtes UV Licht mit fluoreszierender Wirkung handelt. This is technically impossible with a conventional cell phone screen. Write me an email if you find a bug. I will try to fix it as soon as possible. Do feature requests also on the same way.