Optical terms[汽车修理知识]

1. Light effect
Unit: lumens per watt[1M/W] Light efficiency refers to the efficiency at which electrical energy is converted into light energy.
2. Light color
Light color is actually color temperature, which can be divided into three categories: warm colors less than 3000K, intermediate colors 3000K to 5000K
Note: Due to the difference in the composition of the light spectrum, even if the light color is the same, the color rendering of the lamp may be different, that is, the color of the light may also be different.
3. Lamp efficiency
Lamp efficiency (also called light output coefficient) is an important standard to measure the energy efficiency of lamps. It is the ratio between the light energy output by the lamp and the light energy output by the light source in the lamp.
4. Color temperature
Unit: Kelvin[K]
When the color emitted by the light source is the same as the color radiated by the'black body' at a certain temperature, the temperature of the'black body' is called the color temperature of the light source. The higher the temperature of the'black body', the more blue components in the spectrum, and the less red components. For example, the light color of an incandescent lamp is warm white, and its color temperature is expressed as 2700K, while the color temperature of a daylight fluorescent lamp is expressed as 6000K.
5. Color rendering
In principle, the artificial light should be the same as the natural light, so that the human eye can correctly distinguish the color of things, and it depends on the location and purpose of the lighting.
Note: The degree to which the light source presents the color of the object is called color rendering. It is usually called'color rendering index' (Ra). Color rendering refers to the relationship between the true color of a thing (its own color) and the color displayed under a certain standard light source. Determination of Ra value: It is defined in DIN6196 standard. For detailed information about indoor artificial lighting, please refer to DIN5035 standard.
6. Light and radiation
Light is electromagnetic waves radiated to human eyes and converted into light by the optic nerve, which is the part of the spectrum that can be seen by the naked eye. The wavelength range of this type of radiation is between 360 and 830 nm, which is only a very small part of the electromagnetic radiation spectrum. The temperature is much higher than the working temperature of 50HZ, resulting in a higher color temperature white color table and better color rendering.
7. Light energy
Unit: Lumen[lm]The sum of the energy emitted by the light source and received by human eyes is the luminous flux.
8. Light intensity
Unit: Candela[Cd]Generally speaking, light rays are emitted in different directions and have different intensities. The luminous flux emitted by visible light in a certain direction angle is called light intensity.
9. Illuminance E
Unit: Lux[LX]Illuminance (E) is the ratio of luminous flux to the illuminated area.
10. Brightness L
Unit: Candela/square meter[cd/m2] Luminance (L) is the intensity of the reflection of the object seen by the eye from a certain direction Related: ·Attention to driving in rainy season: calmly deal with flexible handling when wading[汽车维修常识]
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