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 ...

With the passage of the Energy Independence and Security Act in 2007, the US began phasing out traditional incandescent light bulbs. As the usage of incandescents dimmed, two new types of bulbs ...

In some people that are photosensitive, 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 ...