Technical Terms of Light and Lamps (I)

1 ac accent lighting

A directional lighting used to emphasize a particular target, or to highlight a part of the horizon

2 accommodation (accommodation)

The process of changing the focus of a person's eyes from one point to another

3 compliance (adaptation)

Refers to the process of the human visual system adapting more or less, or different shades of light, which affects the visual acuity

4 Ambient lighting

Refers to regional lighting that can produce full lighting

5 average luminance, of a surface

Refers to the total luminous flux per unit area off the light surface

6 average luminance, of a luminaire

Refers to the illuminance at a given angle divided by the projected area of ​​the luminaire in that direction

7 baffle

Refers to an opaque or translucent object that shields light from direct light at a particular angle or absorbs light that does not require light

8 ballast

Refers to a device used with a discharge lamp to obtain current, voltage, and waveform conditions for the desired circuit during startup and operation

9 beam angle

Refers to the angle between two directions of 50% of maximum luminosity on a plane perpendicular to the centerline of the beam.

10 Brightness

Reference subjective brightness,luminance,veiling luminance

11 New Candlelight (candela, CD)

Photometric unit, refer to Figure F1; point light as the center, a radius of one meter for the ball, such as through the spherical surface of a square meter area of ​​light is first-class bright, then the direction of the brightness is called a new candlelight

12 cancandle power

I=dX/dS, in new candlelight

13 Candle power distribution curve

Refers to the curve of the photometric variation of a light or light source centered on a plane using polar coordinates

14 cleCreation story

Refers to a building with a transparent roof or a lighting design with a lighting glass window

15 coefficient of utilization

Refers to the ratio of lumen fluence calculated to the estimated radiated flux of the lamp (equivalent to room utilization x lamp efficiency)

16 color rendering

The color of the appearance of a target under a light source is compared with the original color of a target light source (such as sunlight).

17 Contrast (contrast)

Reference luminance

18 Contrast sensitivity

The ability to detect the difference in luminance, which is equal to the reciprocal of the comparative limit if it is stated qualitatively

19 cut lamp off angle (cutoff angle of a luminaire)

From the lowest point of measurement, the angle between the first light and the vertical line of naked light cannot be seen by the human eye

20 d diffuse reflection

Refers to the process of reflection of the incident beam within a certain range of angles

21 ̇ diffuse lighting (diffused lighting)

Means that the incident light is not primarily from a single, special direction

22 ̇ diffuser (diffuser)

Refers to a device that can be used to reflect or scatter the light emitted by a light source, usually by diffusion

23 directDirect glare

In the field of view due to extreme brightness or glare caused by insufficient light source shielding or high-brightness reflection

24 directional lighting

Refers to illumination from a single direction on a work surface or target

25 Disability glare

Refers to the glare that reduces visual function and brightness

26 discomfort glare

The commander feels uncomfortable glare

27 efficacy

Refer to luminous efficacy of a source of light

28 ̇efficiency

Reference luminaire efficiency,luminous efficacy of a source of light

29 - discharge lamp (electric-discharge lamp)

An electric lamp that emits light through a special vapor or gas and thus produces light or close to the radiant energy of visible light

30 fenestration

Refers to the use of windowing or windowing arrangements (usually controlled by optical media)

31 rake angle or field angle

In a plane perpendicular to the centerline of the beam, the luminosity is equal to the angle between two directions of the maximum luminosity of 10%

32 fixtures

Refer to luminaire

33 floodlight

Refers to a light projector designed to illuminate a scene or object when the lighting needs of the reference scene or object are much stronger than its background.

34 fluorFluorescent lamp

A low-pressure mercury discharge lamp

35 mountedFlush mounted or recessed luminaire

Refers to a light fixture installed in the ceiling (or placed in a wall or other compartment). The light's opening is usually aligned with its plane

36 luminous flux

Reference luminous flux

37 foot candle (fc)

The unit of illumination when the length is given in units of ;; the illumination of a candlelight can be obtained by shining a first-class bright beam of light over an area of ​​one square inch.

38 gengeneral lighting (general lighting)

A lighting design that provides a uniform distribution of illuminance in all areas

39 glare

In the field of vision, a feeling of light that the human eye cannot adapt to may cause disgust, discomfort, or loss of visibility.

40 high high intensity dischare lamp

Including mercury lamps, complex metal lamps and high pressure sodium lamps

41 high pressure sodium (HPS) lamp

A high-luminosity discharge lamp that emits light at a pressure of 1.33 x 104 Pa (100 Torr) in a lamp containing sodium gas

42 Illumination

E=dX/dA, refers to the incident light flux density accepted on the work surface; the unit is Lux, the United States and the United States is a foot-candle, 1fc=10.76lux

43 illuminance (lux or foot candle meter)

An instrument for measuring illuminance on a plane

44 Illumination

Refers to actions illuminated by lights or illuminated by lights

45 incandescent filament lamp

The incandescent light emitting lamp is made by passing the filament through an electric current

46 Intensity

Luminous intensity and radiant intensity

47 Inverse-square law

E=I/d2; illuminance is inversely proportional to distance squared and proportional to luminosity

48 Isolux (isofootcandle line)

Refers to the curve where all points of the same illuminance are plotted with appropriate coordinates on the illuminated surface; different illuminance lines constitute the illuminance map

49 lamps

General term for artificial light sources

50 Lamp lumen depreciation factor (LLD)

A multiplier used for lighting calculations, indicating the relationship between the initial illumination of the lamp and the expected minimum illumination of the lamp used

51 lamp lamp shielding angle

Refers to the angle between the plane of the electric light shielding body or the raft, and the horizontal plane closest to the tangent direction of the electric light and the raft plate. Usually the light-screen shading angle is greater than (never less than) the shading angle of the seesaw

52 Lens lens

A glass or plastic component used on a luminaire that can change the direction of light or control the distribution of light distribution

53 light

Can excite the radiant energy that the retina produces visual ability; The visible spectrum of electromagnetic waves is 380～770nm (10-9m)

54 light loss factor (LLF)

A factor used to calculate the intensity of illumination in a known situation and over a period of time, taking into account factors such as temperature, voltage fluctuations, the amount of lamp and house exterior dust accumulation, lamp depreciation, and atmospheric conditions. Also previously known as the maintenance factor.