As a lighting person, lighting knowledge must be solid and firm, but the status quo is like the way we often hang on the lips, the illuminance, brightness, color temperature, color difference and other words, in addition, There are many lighting vocabularies for the lighting industry, just because we have less everyday, so some of you may have heard it, but most of them are in the wind. Based on this, Xiaobian avatars are small angels, and they have compiled the lighting industry for everyone. Commonly used professional vocabulary and notes, please take it, no thanks!
1, green lighting green lights
The green lighting connotation includes four indicators of high efficiency, energy saving, environmental protection, safety and comfort, which are indispensable. Energy-efficient means that you can get enough lighting by consuming less electric energy, which can significantly reduce the emission of air pollutants from power plants and achieve environmental protection. Safety and comfort mean that the light is clear, soft and does not produce harmful light such as ultraviolet rays and glare, and does not cause light pollution.
2, visual work visual task
In the work and activities, the observation process of the details and targets presented in front of the background. Visual work is divided into primary visual work and secondary visual work, depending on the area in which the vision stays.
Figure: The main illumination area of ​​the desk lamp is the main visual operation, and the diffused light is the secondary visual operation.
3, luminous flux luminous flux
Light metric derived from the effect of radiation on a standard luminosity observer. The unit is lumens (lm), 1lm=1cd/1sr. For Ming Vision there are:
In the middle
dΦe(λ)/dλ--the spectral distribution of the radiant flux;
ν(λ)--spectral light (visual) efficiency;
Km - The maximum value of the spectral (visual) performance of radiation in lumens per watt (lm/W). In the case of monochromatic radiation, the Km value under bright visual conditions is 683 lm/W (when λm = 555 nm).
Figure: Schematic diagram of luminous flux principle
4, luminous intensity
The luminous intensity of the illuminant in a given direction is the quotient obtained by dividing the luminous flux dΦ transmitted in the solid angle element dΩ of the illuminating body by the solid angle element, that is, the luminous flux per unit solid angle. The unit is Candela (cd), lcd = 1 lm / sr.
Figure: Schematic diagram of luminous intensity distribution
5, brightness luminance
The amount defined by the formula L = d2 Φ / (dA · cos θ · d Ω), the unit is candela per square meter (cd / m2).
In the middle
dΦ--the luminous flux (lm) transmitted by a beam element at a given point and containing a solid angle dΩ in a given direction;
dA--including the beam cross-sectional area (m2) at a given point;
Θ—the angle between the normal of the beam section and the beam direction.
6, illuminance illuminance
Light intensity refers to the energy of visible light per unit area, referred to as illuminance, unit lux (Lux or Lx). A physical term 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 of the luminous flux dΦ incident on the bin including the point divided by the panel area dA, and the unit is lux (lx), 1lx=1lx/m2.
Many students will confuse the illuminance and brightness. How do you distinguish it? A picture tells you!
Figure: The way in which brightness and illuminance are generated and distinguished. (LOGO hand-painted)
So, the same space, different basic tone contrast requirements are different
Figure: Requirements for classroom contrast in white base tones. (LEGO hand-painted)
Figure: Requirements for classroom contrast in black base tones. (LEGO hand-painted)
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