Light source knowledge


  Light source Illumination light sources have dif […]


Light source
Illumination light sources have different photoelectric characteristics due to their different lighting conditions. In order to select lighting sources correctly, it is necessary to understand their electrical characteristics, photoelectric characteristics and applicable occasions.

1. Classification of light source:
The classification of lighting sources is classified according to different forms of light emission. It can be divided into two categories: radiation source and gas discharge lighting source. The former uses electric current to pass through an electric wire to heat it to an incandescent state to emit visible light; the latter uses certain element atoms to be excited by electrons to generate radiation.

Lamp noun explanation
Lamp efficiency:
Lamp efficiency refers to the ratio of the luminous flux value emitted by the lamp measured under the specified conditions to the sum of the measured luminous flux values ​​emitted by all light sources in the lamp.

1/2 illuminance angle
Put the lamp axis perpendicular to a point on the horizontal plane under the lamp. If the horizontal illuminance is 1/2 of the illuminance directly below the lamp axis, the angle formed by the line between this point and the light center and the lamp axis is called the 1/2 illuminance angle.

The arrangement distance of the lamps is compared into
The distance between two adjacent lamps of the same type of lamp is L, and the installation height of the lamp is H, then the distance is 入=L/H.

Recessed luminaire: a luminaire that is completely and partially embedded in the installation surface.
Ordinary lamps: provide protection for live parts, but there are no special dust-proof, solid foreign matter and waterproof lamps.

Selection of lamps:
In lighting design, the main factors that should be considered in the selection of lamps are:
Light distribution requirements, surface brightness of lamps, color rendering performance, glare.
Environmental conditions, protective requirements when using the environment.
Coordination, whether the appearance of the lamp is coordinated with the building and interior decoration.
Economy, such as lamp efficiency, electric power consumption, investment operation cost, energy saving effect, etc.

Lighting quality

A. Glare:
There are extremely bright objects or strong brightness contrast in the field of view, which can cause discomfort or reduce vision, which is called glare. Glare can be divided into disability glare and uncomfortable light. Any glare that reduces the vision of the human eye, and any unpleasant feeling is called uncomfortable glare. Glare is one of the important factors affecting the quality of lighting.

Causes of glare:
Because of the high brightness stimulation. Make the pupils shrink.
Due to the scattering of intraocular tissues such as corneal lens, a light curtain is formed in the eye;
As the retina is stimulated by high brightness, the adaptation state is destroyed

The main factors causing glare from lamps:
The brightness of the light source (the higher the brightness, the more obvious the glare)
The position of the light source (the closer to the line of sight, the more prominent the glare)
The appearance size and quantity of the light source (the larger the surface area, the more the number of light sources, the more obvious the glare)
Surrounding environment (the darker the environment is, the lower the brightness of the eyes adapts, the glare will be more obvious)