What are the main roles of lighting fixtures

Lighting fixtures are composed of lighting sources, lamp shades and accessories.
A, lighting fixtures are divided into two categories according to the function of decorative lamps and lanterns and functional lamps and lanterns.
1, decorative lamps and lanterns by the combination of decorative parts and lighting sources, in addition to appropriate consideration of lighting efficiency and to prevent glare and other requirements, mainly to meet the needs of architectural art in a beautiful shape.
2, the function of the lamps and lanterns is: redistribute the luminous flux of the light source, improve the efficiency of the use of light and avoid glare, to create a suitable light environment. In the wet, corrosive, explosive, flammable and other special lamps and lanterns used in the environment, the lampshade also plays a role in isolation protection.
Second, lighting fixtures are divided into indoor lighting fixtures and outdoor lighting fixtures according to the use of two categories.
1, indoor lighting fixtures, usually according to the total luminous flux in the space of the upper and lower hemispheres of the distribution ratio classification. The International Commission on Illumination accordingly recommended: the lighting fixtures are divided into direct, semi-direct, uniform diffusion, semi-indirect, indirect five. The following table shows the light distribution and lighting characteristics of different types of luminaires.
2, outdoor lighting fixtures, mainly floodlights. Floodlights, also known as floodlights, are strong light sources using reflectors, lenses and grilles to constrain the light within a small three-dimensional angle, and are often used for night lighting of large buildings.