Technical terms of light and lamps (below)

55 local lighting

Providing illumination to a smaller area or a partial range of lighting design does not provide any significant overall ambient lighting

56 localized general lighting

Refers to the use of lighting fixtures to provide lighting, usually also includes the surrounding lighting of the job

57 louver

A string of reflectors used to shield or absorb unwanted lights at a particular angle, usually in a geometrical arrangement

58 louver shielding angle

Refers to the angle between the level of the light shield or shutter and the level where all the fixtures in the fixture are hidden

59 louvered ceiling

A ceiling-type area lighting system, which is shielded by a light source mounted thereon by a multi-lattice shutter

60 lumens

The unit of luminous flux, refer to Figure F1; the beam of a new candle light source within the unit solid angle is equal to

61 lumen (or flux) method

A lighting design program that determines the relationship between the number or type of lights or fixtures, room characteristics, and the average illumination level of the work surface. It considers both direct flux and reflected light flux.

62 luminaires

Refers to a complete lighting fixture, including one or more lights, and its accessories

63 Luminaire dirt depreciation factor (LDD)

A multiplier used to calculate the illuminance, indicating the relationship between the illuminance of the luminaire when it is clean, new, and the illuminance of the luminaire after it has accumulated dust.

64 luminaire efficiency

Refers to the ratio of the luminous flux emitted by the lamp to the luminous flux emitted by the lamp

65 Luminance (photometric brightness)

Refers to the brightness of an area per unit area of ​​a face in a known direction from any direction. All visible objects have some brightness.

66 luminance contrast (luminance contrast)

Refers to the relationship between target luminance and its direct background luminance

67 luminance difference

Refers to the difference in the size of the brightness of the two regions

68 luminosity ratio

The ratio of the brightness in the two regions within the field of vision

69 Luminous ceiling

It is a kind of ceiling-type regional lighting system, which uses a continuous plane that can be penetrated by light. The light source is installed on it and can be diffused or controlled to change light

70 luminous efficacy of a source of light

Equal to the total luminous flux emitted by the lamp divided by the total input power, in lumens/watt

71 luminous flux (beam) (luminous flux)

Refers to the total amount of light emitted by a light source in a given unit of time, commonly known as the beam, in lumens

72 Luminous intensity

The point light source emits light in a known direction, and the luminous flux emitted in the unit solid angle is said to be in units of candlelight or lumen/solid angle

73 lux

The illumination unit of SI makes it possible to obtain an illuminance of 1 lux when the first-class light beam illuminates a working surface of 1 square meter.

74 mainMaintenance factor (MF)

Refers to the ratio of the illumination of a region after a certain period of time compared with the initial illumination

75 matte surface

Finger reflections are mainly negligible diffuse components, see diffuse reflection

76 ̇ halogenated metal lamp, metal halide lamp

It refers to a high intensity discharge lamp (HID) whose emission is mainly radiated by halogenated metals and their dissociated atoms (in combination with, for example, mercury metal vapors).

77 mercury lamp (mercury lamp)

It refers to a high-intensity discharge lamp (HID), which is mainly made by irradiating mercury with a pressure of 105 Pa (approximately atmospheric pressure).

78 mounting height above the work-plane

Refers to the distance from the work surface to the center of the lamp light source, or the distance to the ceiling (in the case of recessed luminaires)

79 point method (point method)

Also called a point-by-point method; it is a lighting design program that uses the lighting brightness data of a luminaire to determine the illuminance of a lighting system installed at different locations. The total illuminance at a certain point is equal to the sum of the direct illuminance of the luminaire and the illuminance between the surface of the room

80 ̇ primary playing area

The entire competition area where the illuminance level must be maintained

81 quality of lighting (quality of lighting)

Measuring the distribution of lighting in a visual environment. This term is often used as a positive assessment to indicate whether all lighting meets the requirements for visual function, visual comfort, easy-to-see, safety, and beauty.

82 reflectance of a surface or medium

DXr/Di, the ratio of the reflected light flux to the incident light flux

83 reflected glare (reflected glare)

Refers to the glare caused by the high reflection of light generated by the light body or the smooth object in the field of view

84 reflection

Refers to a general term describing the process of the flux of incident light exiting from the surface of illumination or the incident surface of the medium

85 reflector

Refers to a device that regenerates luminous flux by reflection

86 room utilization factor (utilance)

Refers to the ratio of the luminous flux received by the working face to the luminous flux emitted by the lamp

87 second secondary playing area

Refers to the area between the main competition area and actual obstacles (such as fences)

88 shield luminaire shielding angle (of a luminaire)

Refers to the angle between the horizontal line through the center of the light source and the first line bare light that can be seen by the human eye.

89 spotlight

Refers to lamps that have a very narrow beam angle to illuminate a particular area

90 stray light

Generally refers to the light beyond the eye's retina line of sight

91 subjective brightness (subjective brightness)

Refers to any of the main attributes of light perception due to light perception, including visual attributes for all brightness, illuminance, luminance, bleakness, or darkness.

92 su Supplementary lighting (supplementary lighting)

Refers to lighting that provides additional mass and illuminance, which cannot be obtained with a full-scale lighting system. It is usually installed for special work needs.

93 surface mount luminaire

Refers to fixtures mounted directly on the ceiling

94 tatask lighting

Refers to a direct illumination of a particular spot or area, providing adequate illumination depending on the job

95 ̇ transmission

P=Xt/Xi; refers to the ratio of the transmitted light flux to the incident light flux

96 ̇transmittance

The process by which the incoming light flux exits from the other side of the illuminated surface or the medium incident surface

97 tungsten-halogen lamp

Refers to an inflatable tungsten incandescent lamp

98 Veiling luminance

Refers to a way of reducing the contrast of retinal images. In the field of vision, this method can be used to change the visual function and the brightness of bright light areas.

99 veiling reflection

Diffuse reflections from the light curtain will reduce the contrast of the light, making the target less clear

100 visibility

Refers to the quality and status of human vision. In outdoor, it refers to the distance that the target can be perceived by the human eye; in the interior, it refers to the ability to see the actual object in the standard visual environment and clearly contrast.

101 ̇ visual acuity or visual acuity

Refers to a kind of measurement visual ability that can identify the clarity of the target

102 visual angle

Refers to the arc angle from the observation point to the target or specific object, usually measured in circular arc

103 Field of vision or visual field

If the head and eyes stay fixed, the trajectory of the target or point in the space can be seen by the human eye.

104 visual perception

Refers to the interpretation of real world impressions from the human eye to the brain from the retina

105 Visual performance

Calculate speed and accuracy into consideration A quantitative assessment of the illuminance of a job

106 Visual surround

In addition to the view part of the job

107 contempt for jobs (visual task)

Traditionally refers to the completion of a visual condition necessary to give a task. In this condition, all relevant objects and working details can be seen

108 ̇ Working face (work-plane)

Usually refers to the place where the work is completed. The standard of illumination is set at the place and measured. Unless otherwise stated, it is generally assumed that it is located at a level of 0.76 meters (30 feet) above the floor.

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