Light source elements of led lamp design
1. Luminous flux of LED lamps
Luminous flux (unit; lumens lm), refers to the radiant power that the human eye can perceive. It is equal to the product of the radiant energy of a certain band in unit time and the relative visibility of the band. Because the relative visibility of the human eye to different wavelengths of light is different. Therefore, when the radiated power of light of different wavelengths is equal. The luminous flux is not equal. Indicates how much the luminous body emits. Lumen is a unit of luminous flux (the more luminous, the greater the number of lumens).
2. The light effect of LED lamps
The ability of an electric light source to convert electrical energy into light, the ratio of the luminous flux emitted by the light source to the electrical power consumed, is an optical quantity that describes the quality and economy of the light source, in lumens/watt (lm/W).
3. The average lifespan of LED lamps
The average life, also known as the rated life, refers to the number of hours that a batch of lamps is lit to half the number of damaged ones.
4. The light intensity of LED lamps
The luminous flux emitted by a luminous body within a unit solid angle in a specific direction. The unit is candela (cd) [the international unit is candela (candela) abbreviated cd, and other units are candlelight and branch light. 1cd or l000mcd refers to the light of a monochromatic light source (frequency 540*1012Hz, wavelength 0.550um). In a given direction [the radiant intensity in this direction is (l/683)W/(Sr·㎡) (W/Steradian) The luminous intensity emitted within the unit solid angle of the mouth.
Light intensity is the brightness of the lighting light emitted by the lamp. The light intensity needs to be selected and adjusted according to the environment in which it is used. In general, too bright can make people feel dazzling, too dark and people can't see objects clearly. In certain occasions, if you want a bright environment, you should choose lamps with high light intensity, such as football fields or gymnasiums.
5. Illumination of LED lamps
Luminosity refers to the degree to which an object is illuminated, expressed by the luminous flux received per unit area. The unit is lux (lux, lx), that is, lm/㎡. The luminous flux of llux=l lumens (lm) is uniformly distributed on the illuminance of 1㎡ area. Illuminance is based on the luminous flux received by the vertical plane.
6. Brightness of LED lamps
Brightness is a physical quantity used to express the intensity of light (or reflection) on the surface of an object. The ratio of the light-emitting intensity of the light-emitting surface of the object to be viewed in the direction of sight to the projected area of the light-emitting surface in the direction perpendicular to the direction is called the surface of the light-emitting surface. brightness. The unit is candela per square meter (cd/㎡).
7. Beam angle of LED lamps
The beam angle refers to the angle of the light of the lamp and the angle of the lamp cup. Generally, there are 3 types: 10°, 24°, and 380°.
8. The light environment of LED lamps The light environment is people's psychological feelings about light in a certain visual space. A good light environment produces a good visual experience, which directly affects people's physical and mental health. When people consider creating a good light environment, they should also consider the issue of energy saving. The concept of green lighting is how to reduce the release of mercury and how to save the limited energy for human survival.
Common LED lamps and lanterns include: led lamps, led fluorescent lamps, led high bay lamps, led street lamps, etc. The luminous efficiency can currently reach about 140lm/W, and the specific luminous flux is proportional to the power.
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