Electric light source color characteristics

Luminous flux: The sum of the amount of visible light emitted by the source per second, which is simply the amount of luminescence. Unit: Lumens (lm); Illuminance: The amount of light incident in a unit area, that is, the value obtained by dividing the luminous flux by the area. Unit: lux, illuminance is divided into horizontal illumination and vertical illumination. The horizontal illuminance is the illuminance of the incident horizontal surface of the luminous flux, and the vertical illuminance is the illuminance of the luminous flux incident on the vertical plane. Illuminance [lx] = luminous flux falling on a certain area [lm] This is the area of ​​the illuminated surface [m2] = light intensity [cd] / (distance [m]) 2L; brightness: symbol L, unit Nyd cd / m2, description The luminous flux colorimetric property of the illuminant in a specific direction unit solid angle unit area: the degree to which the light source presents to the color of the object itself is called color rendering, that is, the degree of color fidelity; the light source with high color rendering performance is better for color. The color that people see is close to the natural color, and the light source with low color rendering has poor color performance, and the color deviation seen by people is also large. The International Commission on Illumination CIE sets the sun's color rendering index to 100. Color rendering index: The color rendering of the light source is indicated by the color rendering index, which indicates the deviation of the color of the object under the light from the reference light (sunlight) illumination, which can reflect the color characteristics of the light source more comprehensively.

Color temperature of energy-saving electric light source: expressed by absolute temperature K (Kelvin), which is a standard black body heating. When the temperature rises to a certain extent, the color begins to change from deep red-light red-orange-white-blue, a certain light source and black body. When the colors are the same, we refer to the absolute temperature of the black body as the color temperature of the light source. Light effect: Unit: Lm/w per watt lumen, indicating the ability of an electric light source to convert electrical energy into light, expressed as the luminous flux emitted divided by the power consumption. Light efficiency is an important indicator to measure the energy saving of a light source, which is the luminous flux emitted by the light source divided by the power consumed by the light source. Luminaire efficiency: Luminaire efficiency (also known as luminaire light output ratio) is an important criterion for evaluating the energy efficiency of a luminaire. The value is obtained by dividing the luminous flux emitted by the luminaire with the light source by the luminous flux emitted by the installed light source itself. The ratio. Average life: unit: hour, which means the number of hours when a batch of bulbs is reduced to 50%; economic life: unit: hour, indicating the comprehensive consideration of the damage of the bulb and the attenuation of the beam output. The beam output is reduced to a specific number of hours. This ratio is 70% for outdoor light sources and 80% for indoor light sources such as fluorescent lamps. Glare: Objects with extremely high brightness or strong contrast in the field of view can cause visual discomfort called glare. Glare is divided into disability glare and discomfort glare, which is an important factor affecting the quality of lighting.