Primitively incandescent lights were used. Glass bulb containing tungsten filaments which produce light on passage of electric current were the common method of lighting. However in 19the century evolutions in electrical field lead to invention of fluorescent lighting fixtures.
What is fluorescent lighting?
Fluorescent lighting can include any of fluorescent bulb, tube or a lamp. The basic dynamics involve in producing fluorescence is that passage of electricity excites electrons of mercury and enable it to emit ultraviolet rays of short wavelengths which upon striking phosphorus coating help the fixture to glow. This thing needs to be kept in mind that normally fluorescent tubes are low pressure mercury vapor discharge tube.
Cost and electricity
You will find fluorescent lighting everywhere ranging from offices, hospitals, homes, schools, airports, shopping malls and other public places. One of the main reasons of using these lighting is that it greatly conserves energy and reduces the electricity bill. Energy crisis which is one of the most chronic issue of underdeveloped countries and they need ways and means to conserve energy. Fluorescent lighting is an aiding tool for such countries. Although the initial cost of buying and placing fluorescent lights is expensive but that is really overcome by the future savings incurred to you after having these lights placed. You can now have your any desired light fixture such as wall sconces, lamps, pendant lights and track lights to be equipped with fluorescent lighting. Fluorescent lights are preferred over incandescent lamps since they convert more input of electrical energy to visible light.
Hazards of fluorescent lighting
Everything has its pros and cons and a critical evaluation of it is necessary to reach a decision. Although it is beneficial in conserving energy and cost but eco friendly people are really against the massive production of fluorescent lightings since it uses mercury which is hazardous to living beings. There is no proper disposal of mercury. When mercury is enclosed inside the phosphorous tube it is expected to harm the environment by a fraction of total amount however broken or damaged tubes poses safety and health hazard. Another drawback of such lighting is the frequent replacement. The life span normally depends on switching on and off the lights. So if you live in such circumstances where frequency of switching off and on lights is higher your lights will age rapidly and you are expected to buy some new lights for the area.