This stands for "blacklight".īlacklight sources may be specially designed fluorescent lamps, mercury-vapor lamps, light-emitting diodes (LEDs), lasers, or incandescent lamps. These tubes are made for use in " bug zapper" insect traps, and are identified by the industry designation "BL". ![]() A second type of lamp produces ultraviolet but does not have the filter material, so it produces more visible light and has a blue color when operating. Blacklight lamps which have this filter have a lighting industry designation that includes the letters "BLB". ![]() One type of lamp has a violet filter material, either on the bulb or in a separate glass filter in the lamp housing, which blocks most visible light and allows through UV, so the lamp has a dim violet glow when operating. The violet glow of a black light is not the UV light itself, but visible light that escapes being filtered out by the filter material in the glass envelope.Ī blacklight, also called a UV-A light, Wood's lamp, or ultraviolet light, is a lamp that emits long-wave ( UV-A) ultraviolet light and very little visible light. Most of what we see from a black light is the effect it has by making things such as our shirts and teeth glow.Black light fluorescent tubes. The light emitted by black lights is mostly UV, which is invisible to the human eye. Phosphors convert the energy from UV radiation in black lights into a small amount of light we can see. What we see glowing under black lights are phosphors, which is any substance emitting visible light when responding to radiation. Black lights can also be used to authenticate artwork or test counterfeit bills. Restaurants and grocery stores use black lights for insect protection, and forensic scientists use them for crime scene analysis. However, they aren’t just for show, they have many functional uses as well. We often see black lights in bowling alleys, amusement parks, clubs, for Halloween displays, and in other fun locations. If you’re looking for something to use on a smaller scale, CFL black lights are a convenient way to add some spooky vibes to your Halloween house party. We offer a variety of T8 and T12 tubes, U-shaped tubes, and CFL bulbs.īlack lights in various tube shapes are great solutions for places such as bowling alleys and amusement parks. There are even natural phosphors in our teeth and fingernails!īlack lights come in fluorescent, incandescent, mercury vapor and LED technologies. Some paints, posters, TV screens, and all glow-in-the-dark products glow in response to black light. ![]() Lighter articles of clothing, especially white colors, often glow under black lighting. However, the light emitted is bluer instead of purple.īlack lights respond to phosphors in the environment around them, making things containing phosphors glow. ![]() A true black light emits more visible light than a black light-blue bulb. The rest of what the bulb emits is ultraviolet light in UVA form, which makes fluorescent colors glow but is not seen by the human eye. A black light-blue bulb keeps almost all visible light inside the bulb so only a slight purple glow is emitted. There are two different kinds of black lights.
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