The UV flashlight can be very useful and used for a variety of purposes.
There are some professions) with UV (BlackLight to do work. For example, air-conditioning mechanic and automotive repair, especially repair radiator and a / c on. There, they inject a liquid UV dye in the system and the use of UV flashlight to find leaks. The dye is easily recognized fluoresce (glow) in the presence of UV light the leak.
Police forensics Specialists used UV light for substances (such as body fluids) to identify and take fingerprints. Some of these operations require different chemicals to fluoresce the item. Others, such as the invoice or fake ID detection can be done only with the light. The UV light shines on a $ 20 bill, for example, you see the authenticity inlay strips, the inside of the bill.
Consumer applications include: Scorpion hunting (the little devil in the night shine bright, when under a UV --> Light) and sanitation. If you want to stay please first the bathroom of the hotel or motel where you live. Human waste like urine to fluoresce, and if its not cleaned up properly, you will easily be able to see them in a darkened room. (Darkening of the room you can improve the contrast of the fluorescence) will see orange glasses. You can also use blankets, sheets and the remote control and door handles. You can not fail to touch these things, you shoulddetermine if its safe to do so. You will quickly learn that first, what to do after checking in and bring some disposable alcohol wipes with you. Similarly, the UV light to detect stains PET is useful for both old and new. By knowing the extent of the spots you can do a better job of cleaning to do it completely.
Well, what is the best black for your purposes?
For most consumer needs, the torch design with LED displays for the light source is to be the most reliableand convenient. The LEDs last almost always draw less power and make your batteries go further.
Security considerations: The UV light with an output of 395nM (nanometer) range or higher is generally required not to any additional safety equipment, as this is not dangerous as long-wave radiation and for occasional use. Of course you should not look directly into the light for long periods.