This product works best in complete darkness and is not intended to light up a whole room or space. Best used to make things glow up close such as: Check for counterfeit money, stains, hotel room cleanliness & much more!; See UV hand stamps, UV body paint, antique glass & scorpions; Has both a 4W UV bulb & also a torchlight.; Compact, portable, battery operated (4x AA); Has a handy nylon carrying cord