Solid state lighting is a new technology that could be the main artificial light source in future. High-pressure discharge lamps produce brighter light and are used to illuminate large buildings, in TV or film making and for street lighting. Some lamps keep the gas at low pressures and the most common example of this type are fluorescent lamps. The basic design is also a gas sealed inside a tube but there are many different variations. Halogen lamps follow the same principle but they also contain a gas inside the tube that makes the light much brighter and the lamp more efficient.Įlectrical discharge lamps produce light by sending an electric current through a gas. These are the traditional light bulbs that have been in use for many years but are now being phased out in favour of more energy-efficient lights. The advent of electricity brought incandescent lights where typically a metal filament is sealed inside a glass tube and electricity is used to heat up the metal until it glows. Humans have long created artificial lights by burning or heating materials, and candles as well as other flame operated lamps are still in common use today. Metal halide lamps can pose a risk if used close to the skin, but they are not intended for that. ![]() Using some types of CFLs for long periods of time at close distances may expose users to levels of UV nearing the limits set to protect workers from skin and eye damage. ![]() They also argue that protective measures such as covering the lamps with a second glass envelope (which decreases the UV-emissions), are ineffective. Some people with diseases that make them sensitive to light claim that the energy-saving lamps (mainly compact fluorescent lamps (CFLs) and light emitting diodes (LEDs)) that have been brought to replace incandescent lamps, make their symptoms worse and play a role in a wide range of diseases. The ultraviolet and the blue components of light have the greatest potential to cause harm. Both natural and artificial light can also disrupt the human body clock and the hormonal system, and this can cause health problems. Artificial light is composed of visible light as well as some ultraviolet (UV) and infrared (IR) radiations, and there is a concern that the emission levels of some lamps could be harmful for the skin and the eyes.
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