Articles Heating with Wood Contact Us Useful Lighting Terms Lumens measure the quantity of light a lamp produces .
Incandescent light is produced by heating a tungsten filament to a high temperature.
Quartz Halogen lights enclose a tungsten filament in a glass capsule containing halogen gas. Ballasts are required to regulate electricity for use in gas discharge lamps. Most energy- efficient lights require a ballast. The UV radiation is produced by passing an electric arc through argon and mercury gases. Metal Halide lamps create light by passing an electric arc through a tube containing metallic salts, mercury vapour and argon gas.