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.