- Stroboscopic Effect
In the light irradiation of certain frequency change, observing the different movement of objects from its actual movement.
- Light Emitting Diode Lamp
A semiconductor device that emits light from an electroluminescent solid as a light source for an illumination source.
- Distribution of Luminous Intensity
Using a curve or table to show the luminous intensity of the light source or lamp on all direction of the certain area, also known as light distribution.
- Luminous Efficacy of a Light Source
Lumen output emitted by the light source power divided by the power. The unit is lumens per watt (lm / W).
- Luminaire Efficiency
Under the specified using conditions, the total luminous flux emitted by the lamp and the total luminous flux emitted by all the light sources in the lamp, also known as light output ratio.
- Luminaire Efficacy
Under the using conditions, the total luminous flux emitted by the lamp and its input power ratio. The unit is lumens per watt (lm / W).
- Uniformity Ratio of Illuminance
Specifies the ratio of the minimum illuminance to the average illuminance on the surface, denoted by U0.
Due to the illusion of the luminance distribution or the luminance range in the field of view, or the exist of extreme contrast, cause uncomfortable feeling or to reduce the ability to observe the detail or object.
- Direct Glare
From the field of view, especially in the direction of sight near the light generated by the glare.
- Discomfort Glare
Resulting in uncomfortable feeling, but does not necessarily reduce the visibility of the visual object glare.