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50 professional vocabularies that you must know-PART I-Kathy

  • source:Professional Vocabularies
  • Time:05/28/2018

1. Green lights
The green lighting connotation includes four indicators of high-efficiency, energy-saving, environmental protection, safety, and comfort, high-efficiency energy-saving means that sufficient lighting is consumed by consuming less electric power, thereby significantly reducing the emission of atmospheric pollutants from power plants and achieving environmental protection.

Safety and comfort mean that the light is clear, soft and does not produce harmful light such as ultraviolet rays or glare, and no light pollution occurs.

2. Visual tashk
In work and activities, the process of observing the details and goals presented in front of the background. Visual tasks are divided into major visual tasks and secondary visual tasks, depending on the area in which the visual stays.

5 (2)

3. Luminous flux

Light metric derived from the effect of radiation on a standard photometric observer. The unit is lumen (lm), 1lm=1cd/1sr

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4. luminous intensity
The luminous intensity of a luminous body in a given direction is the quotient obtained by dividing the luminous flux dΦ transmitted in the solid element dΩ of the luminous element in this direction by the solid angle element, namely the luminous flux per unit solid angle. The unit is candela (cd), lcd = 1lm/sr

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5. Luminance
The quantity defined by the formula L=d2Φ/(dA·cosθ·dΩ), in candelas per square meter (cd/m 2 ).

In the formula
dΦ - luminous flux (lm) transmitted by a beam element at a given point and containing a given direction of solid angle dΩ;
dA--including the cross-sectional area of the beam at a given point (m2);

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


6.  illuminance
Illumination intensity refers to the energy of visible light received on a unit area, referred to as illuminance, and units Lux (Lux or Lx). In physical terms, used to indicate the intensity of illumination and the amount by which the surface area of an object is illuminated.

The calculation method is the quotient obtained by dividing the luminous flux dΦ incident on the bin containing this point by the bin area dA in lux (lx), 1lx=1lx/m2.

In the same space, the requirements for different basic tone contrasts are different

5 (5)

5 (1)

7. average illuminance

It is very simple, that is, the average value of the illuminance at each point on the specified surface.


8. maintained average illuminance
The average illuminance on the surface should not be less than this value. It is the average illuminance on the specified surface at the time when the lighting device must be maintained.


9. reference plane
Plane for measuring or specifying illuminance


10. working plane
Plane working on its surface

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