Hiram writes
A black light, also referred to as an Ultra Violet Light is a bulb that emits a light that the human eye perceives as deep blue or violet. Most folks associate these lights as the ones that make your white clothes glow in a very dark room. In the pest control industry we know that these lights are highly attractive to flies and they are often used in fly light traps.
Answer last updated on: 07/15/2011
