Environmental factor (Road)
The average illuminance average illuminance of certain width on the sidewalk and driveway width ratio.
High intensity discharge discharge formed by the current flowing through the space between two electrodes.
Arc discharge (gas or vapor)
Compared with the glow discharge, the cathode drop is relatively low.
The bulb shell is internally provided with a high-pressure mercury vapor discharge tube and an incandescent filament, and a light source which is connected in series, such as a ML lamp. The bubble shell can be a diffusion type or coated with fluorescent material.
Regular reflection and diffuse reflection.
Mixing of regular and diffuse transmission.
Optical radiation with wavelengths greater than visible radiation.
The two emission of the cathode is much stronger than that of the emission of the ion.
Blackbody locus (Planck locus)
Chromaticity diagram representing different blackbody temperature (Planck radiator) color curve.
(Planck blackbody radiator)
Heat radiator for all incident light with different wavelength and incident direction or polarization are completely absorbed.
Road lighting cloth mode, when the lamps are placed alternately on both sides of the driveway.
Uniform chromaticity scale (UCS)
Two-dimensional coordinates. The coordinate definition makes the coordinate distance on the whole chromaticity diagram as equal as the color difference of the same brightness.
Illuminate the specified area with high illumination, often used for working face lighting.
The light emitting device (small) is used to make the emission concentrated in the beam at the angle of 20 degrees.
Metal halide lamp
A source of radiation that is produced primarily by the excitation of a mixture of metals (e.g., mercury) and halide compounds (such as thallium, indium, sodium halide). For example: HPI-T light source
Metal vapor discharge lamp
A discharge lamp, which is mainly produced by metal vapor, as opposed to a mercury vapor lamp, sodium vapor lamp, etc..
Mirror factor (S1 and S2)
The amount of light transmitted through the reflecting surface of the illumination system to the illuminated surface.
The illumination of the lamp with a certain light distribution curve is adopted, which makes the light directly reaching the working surface not to exceed 10% of the total luminous flux without considering the boundary of the working surface.
In the installation, the distance between the two successive lamps.
Any radiation that causes visual perception.
Switch start fluorescent lamp
Fluorescent lamp suitable for operation with preheating electrode starter. For example, ''TL' D.
A starting method for igniting a lamp by preheating the filament.
Space coefficient (K)
The geometry of the room is represented and used to calculate the coefficient of utilization or luminous flux utilization.
Unless otherwise stated, the spatial coefficients are given by
K = (L x B) / (H x (L + b))
Among them, l is the length of the room, B is the width of the room, h is the distance between the lamps on the working face.
The ceiling space index can be the same computing formula that is now the H is the distance to the ceiling lamps.
Threshold increment (TI)
Number indicating the degree of control of the disability glare.
The threshold contrast
The minimum perceptible contrast of an eye to a given state.
The brightness of
The visual parameters characterizing how much light is emitted from a surface.
Luminance factor (road surface)
Ratio of average luminance to average illuminance in road lighting system.
Luminance reduction factor (R)
Lamp coefficient (q) and the product of cos3g, where G is the angle of incidence of light.
Luminance distribution curve
A curve representing the luminance of a luminaire in a vertical plane, wherein the luminance is represented as a function of the angle between the vertical and the vertical directions.
The brightness threshold
Minimum brightness that can be perceived.
Luminance contrast (c)
In the visual region, the brightness contrast can be expressed as the difference in the relative brightness:
C= (L1-L2) /L2
Where the brightness of the two parts of the area of different sizes:
L1: the brightness of a small area, such as a subject
L2: the brightness of a larger area such as a background
Luminance factor (q)
On a given direction, the direction of the incident light, the brightness of the unit.
Discharge lamp without preheating of electrode.
The use of factor
The ratio of the luminous flux emitted by the luminous flux to the lamp.
Gas filled lamp containing tungsten filament and a small amount of halogen.
Tungsten halogen lamp
Gas filled tungsten lamp bulb containing halogen or halogen compound.
The angle of the projection area on the surface of the sphere at the center of the sphere of the unit radius
Unit: spherical degree, Sr.
The eye is adapted to at least a few Candela per square meter of brightness. The vision is mainly regulated by cone cells.
Device for changing the spatial distribution of radiation by diffusion.
There is no visible light from a particular direction in the working face or the illuminated object.
There is no regular transmission in the macroscopic angle.