![]() ![]() The speed of light in a vacuum is 3 X 10 8 m/s.Light has a specific frequency or wavelength spectrum.There are various levels of intensity to light.The primary properties of light are as follows: Learn more about Light and its properties Wavelength of 400-700 nm means a frequency range of around 430-750 Terahertz (THz).Visible light has wavelengths that range from 400-700 nm (nanometers) or 4.00 x 10 -7 m to 7.00 x 10 -7 m, between the infrared waves that have longer wavelengths and the UV rays that have shorter wavelengths.Photons are the smallest quantity of energy that can be transported.Electromagnetic spectrum radiation is defined as a stream of photons – particles that have no mass travelling with wavelike properties at the speed of light.Visible light is not very different from other parts of the electromagnetic spectrum except that it can be detected by the naked human eye.Units and Measurements Detailed Video Explanation Electromagnetic radiations are the fluctuations of magnetic and electric fields that transport energy from one location to the other.It plays a fundamental role in the natural world and is used in a wide range of applications, from lighting and communications to medicine and materials science.In addition to being visible, light can also be detected by other norms, such as through the use of cameras, telescopes, and other scientific instruments.Light is able to travel through a vacuum.Light is a form of energy travelling via space in the form of waves, with each wave having a certain frequency and wavelength.Light is a sort of electromagnetic radiation which is visible to the human eye.It describes on the one hand a light source’s impression of brightness, and on the other, a surface and therefore depends to a large extent on the degree of reflection (color and surface).Light or visible light refers to one of the parts of the electromagnetic spectrum that falls between radio waves and gamma radiation. Luminance is the only basic lighting parameter that is perceived by the eye. Performance of very special visual tasks of extremely low contrast and small sizeĪ l = area per lamp (m 2) Example - Illuminationġ0 incandescent lamps of 500 W (10600 lumens per lamp) are used in an area of 50 m 2. Performance of very prolonged and exacting visual tasks Performance of visual tasks of low contrast and very small size for prolonged periods of time ![]() Normal drawing work, detailed mechanical workshops, operation theatersĭetailed drawing work, very detailed mechanical works, electronic workshops, testing and adjustments Supermarkets, mechanical workshops, office landscapes Normal office work, PC work, study library, groceries, show rooms, laboratories, check-out areas, kitchens, auditoriums Warehouses, homes, theaters, archives, loading baysĬoffee break room, technical facilities, ball-mill areas, pulp plants, waiting rooms, Working areas where visual tasks are only occasionally performed Recommended light levels for different types of work spaces are indicated below:Īreas with traffic and corridors - stairways, escalators and travelators - lifts - storage spaces For precision and detailed works the light level may even approach 1500 - 2000 lux. Today the light level is more common in the range 500 - 1000 lux - depending on activity. Earlier it was common with light levels in the range 100 - 300 lux for normal activities. Additional lighting is often necessary to compensate low levels.Īccording EN 12464 Light and lighting - Lighting of workplaces -Indoor work places, the minimum illuminance is 50 lx for walls and 30 lx for ceilings. In the middle area it may be as low as 25 - 50 lux. In a building in the area closest to the windows the light level may be reduced to approximately 1000 lux. The outdoor light level is approximately 10000 lux on a clear day. ![]()
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