HoMedics UV Clean Phone Sanitizer, UV Light Sanitizer

An absolutely FANTASTIC and INCREDIBLY cheap source ($5!!) of clean (low visible light output contamination) UVC light for a variety of purposes beyond sterilization of surfaces, most interestingly for the excitation of fluorescent minerals (see the three attached images - first image with manganocalcite, terlingua calcite, and willemite under normal visible light, then in fluorescing in darkness under the UVC from the Homedics sterilizer, then only the willemite and terlingua calcite phosphorescence in total darkness immediately after the UVC is switched off). Most shortwave UV lights for this purpose cost 10-20 times as much as this device (they must have made thousands of these things in anticipation of high demand during COVID, but now that practically no one cares about that anymore they're clearly trying to dump them here at any cost - so if you're an amateur scientist, their loss is your gain!). Of course, the device has to be modified to defeat the safety interlock and allow it to be turned on while open - this is easy with any magnet (ALWAYS WEAR POLYCARBONATE GOGGLE UV EYE PROTECTION WHILE USING THE MODIFIED DEVICE!). It has two LED emitters which produce around 50 milliwatts of UVC light total at 280 nanometers (10 nanometers FWHM bandwidth of the peak) right on the edge of the UVB range, and VERY little visible light emission. Don't expect it to be a bright source of light like a flashlight, it's very evenly diffuse, NOT very bright, and will only work to induce visible fluorescence of minerals in darkness, but it does work! Incidentally, the 280nm peak of UV emission (I personally measured it on a professional laboratory spectrometer) is WELL within the area of the germicidal effectiveness curve, even though it is some 25nm away from the typical mercury vapor lamp emission line at 255nm, and is definitely sterilizing surfaces exposed to its radiation very quickly. The device is well constructed, runs for 30 seconds after every power button press, can be reactivated again immediately, and recharges easily. HIGHLY recommended for the UV enthusiast and amateur scientist into fluorescence photography (the light output can be even further cleaned with ZWB filters). And at only about 5 bucks, what do you have to lose??