Light is an electromagnetic wave.
The wavelength of visible light from 380nm----780nm
UV wavelength: from 100nm---380nm, invisible to the naked eye.
Infrared wavelength: from 780nm---1mm, invisible to the naked eye.
2, color temperature
To absolute temperature to K. Is a standard blackbody heating, the temperature rises to a certain extent, the color gradually changes from red - red - Orange - white - Blue - white, blue, the characteristics of the changes of light and color, light color and a blackbody source in a temperature of the same color, we will be at the absolute temperature of blackbody the color temperature of the light source is called.
3, color rendering index (Ra)
Measure source appears to be the true color of the object as the parameter.
Color index (0-100) reconstruction source higher color closer to natural colors.
3.1, color temperature and feel
Greater than 6500K
Cool (with blue white)
Fluorescent lamp, mercury lamp
Middle (near natural light)
No obvious psychological effect
Fluorescent lamp, metal halide lamp
Less than 3300K
Warm (with orange yellow white)
Incandescent lamp, halogen lamp cup
3.2, the human body clock and color temperature
3.3, the effect and purpose of color
Light flux (LM Lm)
Said how much the luminous flux, luminous unit is. (the greater the number of light bulbs)
A highly desirable place for color identification, such as printing, printing and dyeing, etc.
Display and display of color television
The color requirements are not high places, such as parking, freight yard, etc.
5, light effect
The luminous flux source and power consumption ratio. Unit: lumen / watt (Lm/W)
6, average life
7, light intensity
Unit solid angle of the flux unit: CD
Illumination is used to illustrate the illuminated area (face) is irradiated on the degree, usually expressed in the luminous flux per unit area received by units for Lux (LX) or lumens per square meter (lm/m2).
Brightness is used to represent the object surface emitting (or reflective) physical strength, the ratio of projection area in the direction perpendicular to the light emitting intensity and luminous surface in the vision object of gaze direction on the surface, the surface brightness of light emitting units per square meter, Candela (cd/m2).
10, luminous efficiency
Commonly referred to as light effect, optical source is described and the quality of the economy, it reflects light at the same time consumption per unit energy radiates much light flux, the unit is lumens per watt (lm/w)
11, beam angle
Below is 3 exactly the same power just 3 different irradiation beam angle lamp on the wall effect diagram and 3 beam light distribution curve. The same power lamp beam angle increases the center light intensity is small, the spot was wider and soft, reflective phase beam angle is smaller and the intensity is big, the more narrow the hard spot.
Effect of different beam angles
12, the appearance of color and illumination
The color index light source and illumination together determine visual clarity environment. There is a balance between illuminance and color rendering index. The results obtained from extensive experiments is: with the display lamp lighting office color index Ra>90, on the satisfaction of their appearance, rather than by the color index of low light (Ra<60) lighting office, illuminance value higher than 25%.
To note is the visual appearance for good, if in order to save energy and reduce indoor illumination to visual function deterioration level, is not feasible. Should choose the best color rendering index and high luminous efficiency of the light source with appropriate illumination, in order to obtain a good visual effect with the minimum energy costs.
General color index range
Examples of application
Ra = 90
Color matching, color inspection, etc.
90>Ra = 80
Printing, food inspection, paint, shops, restaurants, etc.
80>Ra = 60
Mechanical and electrical assembly, surface treatment, control room, office, department stores, etc.
60>Ra = 40
Machining, heat treatment, casting, etc.
40>Ra = 20
Warehouse, heavy metal warehouse
13, color temperature and illumination level
14, light environment
Light environment is the people of light in certain visual space perception psychology.
A good light environment to create a good visual experience, such a good visual experience directly affect people's physical and mental health.
People to create a good light environment at the same time, to consider the problem of energy saving. The concept of green lighting is how to reduce the release of mercury, how to save the limited energy.