Because all types of electric light sources differ in terms of luminous efficiency, longevity, colour, and other factors, the application location also varies. Although general illumination bulbs have a modest light output, they are the most often used type of illumination because they don't require any additional equipment, are inexpensive, easy to use, and can be applied to both indoor and outdoor general illumination applications. Another type of illuminant is a fluorescent lamp, which has a life of up to 10,000 hours and a luminous efficiency that is four to five times greater than that of a regular light bulb. Fluorescent lamps are widely used to illuminate homes, markets, and office buildings.
Because halogen tungsten lamps have a better light efficiency than standard light bulbs, they may be utilised for events that need high levels of illumination, such as lighting for news coverage, filming, and building sites. Shopping centres and residential lighting have both employed low-pressure halogen tungsten bulbs.
Although their colour performance is subpar, high pressure sodium lamps and low pressure sodium lamps are both high light-efficiency, long-lasting light sources that continue to replace many high-pressure mercury lamps despite their poor colour performance.
A new kind of light source called a metal halide lamp was created in the 1960s on the model of a high pressure mercury lamp. Due to its high light efficiency and excellent colour rendering, it is appropriate for high illumination and high colour rendering of the location, including towering manufacturing buildings, busy commercial centres, streets, stadiums, and other big area lighting. In recent years, general illumination in retail centres has been provided by low-power metal halide lights.
The use of electric light sources is also found in the chemical industry's photochemical reaction and the quick drying of surface coatings, in agriculture's insect enticing, fishing, and artificial breeding techniques, in national defence, research and technology, and in the fields of medicine and health care, among other things.
