UV light from sunlight and indoor light sources can trigger a lupus flare. In addition to sunlight, ultraviolet rays are also given off by several different forms of indoor lighting, including compact ...

As the usage of incandescents dimmed, two new types of bulbs rose in popularity: LED (light—emitting diode) and CFL (compact fluorescent lamp). Both LEDs and CFLs are longer-lasting and use far ...

In 1994, Philips launched "EarthLight," an energy-efficient compact fluorescent light (CFL) bulb with a clumsy shape that was incompatible with most conventional lamps; it had a confusing package—and ...

A light source consisting of a long glass tube containing mercury in a partial vacuum. Available in many lengths and several diameters, the tube is lined with a fluorescent phosphor. When the ...

As the usage of incandescents dimmed, two new types of bulbs rose in popularity: LED (light—emitting diode) and CFL (compact fluorescent lamp). Both LEDs and CFLs are longer-lasting and use far ...