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List of other terms of illumination (U-Z)


V'(L) curve

Spectral luminous efficiency curve of dark vision.

V (L) curve

Spectral luminous efficiency curve.


Curtains (or curtain box) lighting

Lighting system comprising a light source that is obscured by a baffle parallel to the wall of the window.

Electrodeless induction lamp

Based on the principle of low pressure mercury vapor lamp design, but there is no electrode, in the discharge device, the gas ionization by high-frequency electromagnetic induction.

Object color

The color of a self luminous or non self luminous object.

Maintenance coefficient

Under the same conditions, the illumination of the lighting system on the working face after a period of service time, and the ratio of the illumination of the new lighting system to the working surface.


Recommended maintenance coefficient, and do not encourage the use of attenuation factor.

Maintenance illuminance

The average illuminance of the lamp at the end of the maintenance period on the reference surface.


Maintenance illuminance is the maximum allowable value of illumination attenuation.


Under illumination (down lamp)

A small light fixture, usually mounted on the ceiling.

Corrected mirror coefficient (S1')

The index of the degree of specular reflection of wet pavement.

Up [down] light output ratio (luminaire efficiency)

The total flux is higher than [luminous flux and bare light emission through the source and below the level of the ratio.


The conversion of radiant energy to other forms of energy by the action of a substance.

Absorption rate (formerly known as absorption factor)

The ratio of absorbed radiant flux to flux.

Small range lighting

Lighting for a specified visual task, separate from the overall lighting.

Note: the lighting is often used in the lighting of smaller surfaces, such as the desktop.

Hanging cloth

A method of road lighting in which the lamp is suspended above the lane in the direction of the line.

Hanging lamp

Luminaire designed to be suspended from a cable, and the optical axis at right angles to the axis of the road.

Hanging lamp

Lamps with ropes, chains, tubes and other accessories that can be mounted on a ceiling or other support.

Suspension distance

Horizontal distance between the center line of the lamp and the edge of the road.

Rotationally symmetric intensity distribution

For a light source, the light intensity distribution can be obtained by rotating a shaft in the same plane by a polar coordinate intensity curve.

Color rendering

The evaluation of the effect of the color of an object under the illumination of a light body and the color effect of the object under the standard illuminant.

Color rendering index (Ra)

Under certain conditions, the parameters of the psychological sensory color produced by a light source and the degree of the psychological color of the object under the irradiation of the standard light source are characterized.

Mutual reflection

The phenomenon of mutual reflection of radiation between several reflecting surfaces.

Correlated color temperature

Under certain conditions, at the same brightness, color and sensory stimuli given Planck a most close to the Planck temperature of the radiator is defined as the temperature. Unit: Kelvin, K.

Relative light

Cloth light method for placing lamps on both sides of road.


An uncomfortable visual condition or observation that is caused by an irrational distribution of light or a range of space or time


Glare control level

Level number for control of discomfort glare.

Glare control

The luminaire properties determined by the specific lamp coefficient (SLI) to describe the level of glare control. Lamps are divided into three categories: limited control, moderate control or close control.


The harmonic is the sum of the harmonic currents of all the integral multiples of the fundamental frequency (50/60HZ).

Harmonic distortion

Alternating current waveform distortion caused by an integer multiple of the fundamental frequency. In the four wire three-phase system odd number of harmonics (such as three times, nine times) will lead to high current in the midline.


Emergency lighting

Lighting methods used in normal lighting interruptions.

Overflow light

For floodlights. Scattered light projected outside the beam.


Photoluminescence of short duration after excitation.

Fluorescent mercury lamp

The utility model relates to a high-pressure mercury lamp, wherein a part of the light is emitted by the mercury vapor, and the other part is emitted by the fluorescent material coating excited by the ultraviolet radiation emitted by the discharge.

Fluorescent lamp

Low pressure mercury discharge lamp. Most of the visible light is emitted by the emission of ultraviolet emission from the discharge.

Note: this term is most commonly used in low pressure tubular fluorescent lamps, such as "'TL", "TL" D, "TL" E.

Concealed lamps

The lamp is mounted on top of the ceiling or mounted on the wall or other surface, so that the visual prominence of the luminaire is not obvious.

Preheat light source (quick start light source)

Hot cathode light source activated by preheating electrode


Central isolation belt lamp

The lamp is placed on a T - shaped bar along the central isolation belt of the two channels.

Intermediate vision

The vision between the bright and dark vision.

Enhanced safety lamp

The utility model can meet the requirements of the sealed lamp when the explosion danger is satisfied.

Total uniformity

The ratio of the minimum and average luminance on the road surface.


The change in the direction of radiation that is caused by the change of the propagation velocity when the radiation passes through an optical interface or from one medium to another.

Refractive grating

Shielding grating based on refraction phenomenon.


Refractive grating is used as a light controller.

Refractive index

Device for changing spatial distribution of luminous flux of light source by using refraction phenomenon.

Illumination (E)

The luminous flux at a point on the surface is divided by the area of the surface.

Units: lux, LX (Lux)


Directions to be illuminated. Such as: when the surface direction is horizontal or vertical, the horizontal or vertical illumination can be obtained.

Illumination uniformity ratio

For a given plane. A measure of the variation of illumination in a plane, in two ways

1 the minimum value of illumination and the ratio of illuminance.

2 the minimum value of illuminance.


Some countries use the ratio of the reciprocal, its value is greater than 1.


The process of irradiating a screen, object, and its surroundings.

Incandescent lighting

Radiation generated by thermal radiation

Lighting environment

Lighting, taking into account the physical and psychological effects.

Direct flux

Direct light from a lighting system to a surface.

Direct ratio

In the interior lighting system, the direct light flux on the working surface and the ratio of all downward radiation to the system.

Direct illumination

On a plane that is assumed to be an area of infinite size, there are 90% to 100% of the radiation light to reach the plane in a direct manner.

Ultraviolet radiation

Optical radiation with a wavelength less than the visible radiation wavelength.

Longitudinal uniformity (U1)

The ratio of the minimum to the maximum value of the luminance is observed in the direction parallel to the road.

Decorative board

Embedded or dome decoration material plate.

Axial beam

At the center of the solid angle, the intensity of the beam is 90% of the maximum illumination.

Cone cells (located in the retina)

Photoreceptor cells of the retina that contain a light sensitive pigment that can be used to introduce visual processes.


Device for use in conjunction with a discharge lamp to assist in starting and / or maintaining a stable discharge current.

Ballast noise

The sound generated by the vibration of the iron chip in the inductance ballast. Because the electronic ballast does not use a large volume of the coil, so the work

Lower noise.

Ballast factor (BF)

The ratio of the luminous flux measured by the light source to the commercial ballast and laboratory reference ballast. The ballast factor is 0.90 which indicates that the flux generated by the light source with the ballast is used as the light source of the light source which is matched with the reference ballast of the ANSI C82.2 or the IEC82 standard.

Ballast loss

Part of the power that is not converted into a source of energy into the ballast. The ballast loss is caused by heat loss.

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