Common technical terms of the hottest lighting

2022-08-23
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Common professional terms of lighting

1 Green lighting

green lighting is the lighting that saves energy, protects the environment, improves people's production, work, learning efficiency and quality of life, and protects physical and mental health

2. Visual work

the observation process of details and targets presented in the background in work and activities

3. Luminous flux

the photometric quantity derived from the effect of radiation on the standard photometric observer. For bright vision:

where d Φ e( λ)/d λ -- Spectral distribution of radiation flux

ν ( λ) -- Spectral light (apparent) efficiency

km - the maximum spectral (apparent) efficiency of radiation, in lumens per watt (lm/w) In monochromatic radiation, the Km value under bright vision is 683lm/w( λ M=555nm). The sign of this quantity is Φ, The unit is lumen (LM), 1lm=1cd/1sr

4 Luminous intensity

the luminous intensity of the illuminant in a given direction is the luminous flux D transmitted by the illuminant in the solid angle D Ω in that direction Φ The quotient obtained by dividing the solid angle element, that is, the total formula of light energy per unit solid angle is:

the symbol of this quantity is l, and the unit is candela (CD), lcd=1lm/sr

5 Brightness

is determined by formula D Φ/(dA·cos θ· D Ω) the quantity defined, that is, the luminous intensity on the unit projected area, and its formula is:

where d Φ-- The solid angle D Ω transmitted by the beam element at a given point and containing the given direction. 2. Shear intensity: the luminous flux of propagation

da - including the beam cross-sectional area at a given point

θ-- The angle between the normal of the beam section and the beam direction

the sign of this quantity is l, and the unit is candela per square meter (cd/m2)

6 Illuminance

the illuminance of a point on the surface is the luminous flux d that people shoot on the bin containing the point Φ The quotient obtained by dividing the bin area Da, i.e.

the symbol of the quantity is e, and the unit is lux (LX), 1lx=1lx/m2

7 Maintain the average illumination

the average illumination on the specified surface shall not be lower than this value. It is the average illumination on the specified surface at the time when the lighting device must be maintained

8. Reference plane

a plane for measuring or specifying illuminance

9. Working surface

the plane on which work is carried out

10. Brightness contrast

the ratio of the brightness difference between the identified object and the background in the field of view to the brightness of the background, that is:

where C - brightness contrast

Δ L - the difference between the brightness of the identified object and the background brightness

lb - background brightness

11. Recognition object

recognized objects and details (such as points, lines, scars, stains, etc.) to be recognized

12. Maintenance factor

the ratio of the average illumination or average brightness of the lighting device on the specified surface after a certain period of use to the average illumination or average brightness obtained on the same surface when the device is newly installed under the same conditions

13. General lighting

uniform lighting set to illuminate the whole place

14. Partition general lighting

for a specific area, such as the place where work is carried out, different illuminance is designed to illuminate the general lighting of the area

15. Local lighting

lighting set for illuminating a certain part for specific visual work

16. Hybrid lighting

lighting composed of general lighting and local lighting

4. Open the oil return valve

17 Normal lighting

indoor and outdoor lighting used under normal conditions

18. Emergency lighting

lighting enabled due to power failure of normal lighting. Emergency lighting includes evacuation lighting, safety lighting and standby lighting

19. Evacuation lighting

as a part of emergency lighting, use the environmental protection capacity of industrial layout in the next step to ensure that evacuation routes are effectively identified and used

20. Safety lighting

as a part of emergency lighting, it is used to ensure the safety of personnel in potential danger

21. Backup lighting

as part of emergency lighting, it is used to ensure that normal activities continue

22. Duty lighting

it is the lighting set for duty during non working hours

23. Guard lighting

lighting installed for vigilance

24. Obstacle lighting

sign lights installed on buildings or structures that may endanger navigation safety

25. Stroboscopic effect

under the illumination of light with a certain frequency, it is observed that the movement of objects is different from its actual movement

26. Light intensity distribution

use curves or tables to represent the luminous intensity values of light sources or lamps in all directions of space, also known as light distribution

27. Luminous efficiency of light source

the quotient of the luminous flux emitted by the light source divided by the power of the light source, referred to as the luminous efficiency of the light source. The unit is lumen per watt (lm/w)

28. Lamp efficiency

under the same service conditions, the sum of the total light flux emitted by the lamp and the total light flux emitted by all light sources in the lamp is also called the lamp light output ratio

29. Uniformity of illumination

the ratio of the minimum illumination to the average illumination on the specified surface

30. Glare

a visual phenomenon that causes discomfort or reduces the ability to observe details or targets due to inappropriate brightness distribution or brightness range in the field of vision, or extreme contrast

31. Direct glare

glare generated by luminaries in the field of vision, especially in the direction close to the line of sight

32. Uncomfortable glare

glare that produces an uncomfortable feeling, but does not necessarily reduce the visibility of visual objects

33. Unified glare value

it is a psychological parameter to measure the subjective response of light emitted by lighting devices in the visual environment to human eyes, and its value can be calculated according to the CIE unified glare value formula

34. Glare value

it is a psychological parameter to measure the subjective response of outdoor stadium and other outdoor field lighting devices to discomfort caused by human eyes, and its value can be calculated according to the CIE glare value formula

35. Reflected glare

glare caused by reflection in the field of vision, especially when the reflected image is seen close to the line of sight

36. Light curtain reflection

specular reflection of visual objects, which reduces the contrast of visual objects, so that it is difficult to see details partially or completely

37. Lamp shading angle

the included angle between the most marginal point of the light source and the connecting line and horizontal line of the lamp outlet

38. Color rendering

the influence of the lighting source on the color table of the object, which is caused by the observer consciously or unconsciously comparing it with the color table under the reference light source

39. Color rendering index

under the color adaptation state with reasonable tolerance, the psychophysical color of the object illuminated by the measured light source is a measure of the degree of compliance with the psychophysical color of the same color as the reference light source. The symbol is r

40. Special color rendering index

under the color adaptation state with reasonable tolerance, the psychophysical color of CIE test color sample illuminated by the tested light source is a measure of the degree of compliance with the psychophysical color of the same color sample illuminated by the reference light source. The symbol is ri

41. General color rendering index

the average value of cie1974 special color rendering index of eight color samples in a group, commonly known as color rendering index. The symbol is RA

42. Color temperature

when the chromaticity of a certain light source (thermal radiation light source) is exactly the same as that of the complete radiator (blackbody) at a certain temperature, the temperature of the complete radiator (blackbody) is referred to as color temperature for short. The symbol is TC, and the unit is on (k)

43. Correlation color temperature

when the chromaticity of a certain light source (gas discharge light source) is closest to the chromaticity of the complete radiator (blackbody) at a certain temperature, the temperature of the complete radiator (blackbody) is referred to as the correlation color temperature. The symbol is TCP, and the unit is on (k)

44. Light source volume maintenance rate

the ratio of the luminous flux of the lamp after a given ignition time to its initial luminous flux

45. Reflectance

the ratio of reflected radiation flux or luminous flux to incident radiation flux or luminous flux under a given state of spectral composition, polarization state and geometric distribution of incident radiation. The symbol is ρ。

46. Lighting power density

lighting installation power per unit area (including light source, ballast or transformer), unit: watt per square meter (w/m2)

47. The chamber shape index

represents the value of the room geometry. The calculation formula is:

where RI - chamber shape index

a - room width

b - room length

h - calculated height of lamps. (end)

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