For people who work in lighting, it’s for sure that we should deeply master the lighting knowledge as much as possible, which should include the specialized vocabulary of lighting. However, when we look around, the most known and frequently used are just a few words like “Color Temperature”, “Color Rendering Index”, “Lumen Output” ect. This is no problem with your clients. But if you want to stand out from other competitors and win the projects. Knowing those words (knowledge) will make you look more professional and trustworthy for your customers. Now, let’s get to know those words together.

  • Green Light

A “Green lighting” should be Energy Efficient, Environmentally Friendly, Safe and Comfortable. Energy Efficient means less energy consumption to obtain enough brightness, thereby significantly reducing emissions of atmospheric pollutants to achieve the purpose of environmental protection. Safety and Comfort refers to the light is clear, soft and does not produce ultraviolet light, glare and other harmful light, no light pollution as well.

  • Visual Task

An observation process of the target and details of the background. Visual work is also made up of major visual tasks and secondary visual work, depending on the area of vision to stay.

  • Luminous Flux

Luminous Flux (Φv) is energy per unit time (dQ/dt) that is radiated from a source over visible wavelengths. More specifically, it is energy radiated over wavelengths sensitive to the human eye, from about 330 nm to 780 nm.

  • Luminous Intensity

Luminous intensity is an expression of the amount of light power emanating from a point source within a solid angle of one steradian.

  • Luminance

The luminous intensity of a surface in a given direction per unit of projected area.

  • Illuminance

In photometry, illuminance is the total luminous flux incident on a surface, per unit area.

  • Average Illuminance

The average value of the surface under the light source.

  • Maintained Average Illuminance

The lowest value required

  • Reference Plane

A plane of measurement or requirements of the illuminance.

  • Working Plane

Where the task is conducted.

  • Maintenance Factor

The average illuminance or average brightness of a lighting device after a certain period of use, on a prescribed surface, and the average illuminance or average brightness obtained on the same surface when the device is newly installed under the same conditions.

Illumination system after used, the illumination of the operating surface is reduced due to the light output caused by lower light transmittance and reflectivity because of the aging lighting system and also environmental pollution. (PS: Among those factors, some are recoverable by clean the lamp or change the light source while some others are irreversible because of the damage of the whole system or the ballast.