Illumination Important Terms
- Light: It is the part of radiant energy from a hot body which produced the visual sensation on human eye.
- Luminious flux: The total quantity of radiant energy per second accountable for visual impact from a luminous body is called Luminious flux.
- Lumen: It is the unit of luminous flux. One lumen is defined as the ratio of luminous flux emitted to unit solid angle from a point source of one candle power.
- Solid angle: Solid angle is defined as the angle subtended by the partial surface area of a sphere at its center.
- Candle power: The light emitting capacity of a source is called its candle power.
- Luminous intensity: It is the luminous flux emitted by the source per unit solid angle in that direction.
- Reduction factor: It is a source of light is the ratio of its mean spherical candle power to its mean horizontal candle power.
- Lux: One meter candle or lux is defined as the illumination produced by a uniform source of one Candle Power on the inner surface of a sphere of radius one meter.
Laws of Illumination
Light is an essential element in human life and the day-to-day activities of human beings eventually depend on the light. Where there is no natural light, the use of artificial light is required. Artificial lighting is generated electrically, because of its cleanliness, ease of control, accuracy, and stable output, as well as its low cost it is taking an increasingly major part in modern everyday life.
The science of illumination engineering has become of major importance. Light is a form of luminous energy. Several forms of incandescent bodies are the reference of light and the light radiated by such bodies depends upon the temperature of bodies. Heat energy is emitted into the medium by a body that is much warmer than the medium surrounding it. The heat of the body can be categorized as red-hot or white-hot.
Table of Content
- Illumination
- Important terms
- Properties
- laws of Illumination
- Solved examples
- Advantages
- Disadvantages
- Applications