[LED people must see] detailed terms and explanations of light and lamps

1 ac accent lighting

A directional illumination used to emphasize a particular target or to draw attention to a part of the field of vision

2 ̇ accommodation (accommodation)

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

3 ̇ 应 ( (adaptation)

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

4 ambi ambient lighting

Refers to all-regional lighting that produces full illumination

5 luminancesurface luminance, of a surface

Refers to the total lumen flux that actually leaves the unit area on the illuminated surface.

6 averaverage luminance, of a luminaire

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

7 ̇ shielding (baffle)

An opaque or translucent object that obscures light at a particular angle or absorbs unwanted light.

8 ballast (ballast)

Refers to a device used with a discharge lamp to obtain the current, voltage, and waveform conditions of the circuit required for starting and running.

9 beam beam angle

Refers to the angle between the two directions of luminosity equal to 50% of the maximum luminosity on one of the planes of the vertical beam centerline

10 ̇ brightness (brightness)

Reference subjective brightness, luminance, veiling luminance

11 new candlelight (candela, cd)

The unit of luminosity, refer to Figure F1; centered on the point source, the radius is one meter for the ball. If the beam on the area of ​​one square meter passing through the sphere is first-class, the luminosity in this direction is called a new candle.

12 candle power (candle power)

I=dX/dS, expressed in new candlelight

13 Candle power distribution curve

Refers to the curve of the luminosity change in a polar coordinate manner on the center of a light source or a light source of a lamp on a plane

14 ̇ roof high window lighting (clere story)

Refers to a building with a transparent roof or a lighting design with walls with glazing

15 co lighting rate (coefficient of utilization)

Refers to the ratio of the luminous flux received at the working surface to the estimated luminous flux of the lamp (equal to room utilization x luminaire efficiency)

16 ̇ color rendering (color rendering)

Refers to whether the appearance of a target under a light source is the same as the original color of the original color under the reference light source (such as daylight).

17 ̇ contrast (contrast)

Reference luminance

18 con contrast sensitivity

The ability to detect differences in luminance, as stated qualitatively, it is equal to the reciprocal of the contrast limit

19 cutcutoff angle of a luminaire

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

20 d diffuse reflection (diffuse reflection)

Refers to the process of reflecting the incident beam back over a range of angles

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