Incandescent light bulbs
Do normal light bulbs emit UV rays?
Although few light sources produce no UV at all, most bulbs fall well within accepted safe limits. In particular, incandescent, LED and sodium vapor bulbs all emit very small amounts of UV radiation. The coiled bulb’s internal phosphor coating can crack, allowing small amounts of UV light to pass through.
Do HPS lights emit UV rays?
UV and Infrared Rays. High-intensity discharge lights include mercury vapor, fluorescent, High-Pressure Sodium (HPS), and Metal Halide (MH) bulbs. All of these grow bulbs emit visible light, as well as Infrared and Ultraviolet light. Ultraviolet light emits UVA, UVB, and UVC radiation.
Do indoor lights give off UV?
Inside the bulb, electrical discharge excites a gas (usually neon or mercury vapour in argon), which emits ultraviolet radiation. But the ultraviolet radiation is not visible to human eyes and must be converted into visible light. In fact many types of lighting used in our homes emit small amounts of UV radiation.
Do fluorescent light bulbs give off UV rays?
As it turns out, all fluorescent light bulbs contain mercury vapor, which emits a lot of UV rays when hit with an electric current. Normally that UV is absorbed by a layer of molecules, called phosphors, on the inside of the bulb and reappears as safe white light. But if that phosphor coating cracks, UV light escapes.