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Glossary of Lighting Terms

Home » Glossary of Lighting Terms (2. Page )
Beam Angle
Beam angle is a statement for how a light source distributes the light. Beam angle expressed in degrees and its...
HPS
HPS is the abbreviation of high-pressure sodium. HPS is a type of high-intensity discharge lamps (HID) and it is one...
Power Factor (PF)
In an alternating current (AC) circuits, the ratio of actual power used on a circuit to the apparent power supplied...
Power
Power (electrical power), indicates the energy quantity that the electrical devices consume unit of time. The unit of power is...
Goniophotometer
Goniophotometer is a test device to measure the light emitted from a light source with different angles. Goniophotometer word constituted...
Uniformity
Uniformity can be expressed by division of minimum bright level to average bright level in the bright field. It is...
Voltage
Electrical potential between two points is called voltage. Potential difference between two points moves electrons in the connected circuit and,...
Fresnel Lens
Fresnel lens is a special lens type using as condenser or light distributor. Generally, fresnel lens is thin sheet form,...
Flicker
Flicker is the light flicker that occurs as a result of the brightness of light changes rapidly and repeatedly. The...
Filament
Filament is a kind of thin wire that produce light when it is heated. It is generally used in old...
Lightbulb Socket
Devices which make the electrical connection of a bulb and fixes the bulb is called lightbulb socket. By the lightbulb...
Diffuser
Optical material takes control of bright light comes from a light source and emit it softly is called diffuser. Diffusers...
Wavelength
Wavelength indicates the distance between repeating units of a waveform (2 peak points). Wavelength is shown by Greek letter (λ)...
CRI (Color Rendering Index)
CRI stands for Color Rendering Index. CRI is an important criterion of the visual performance of a light source. CRI...
CE Mark
CE mark indicates that a product complies with the European Union (EU) regulations and has the related health, safety, and...
Binning
LED chips coming from serial production to have some minor differences, such as light color, light output, and working voltage....
Ballast
Devices that provide the proper voltage and current needed to operate gas discharge lamps such as fluorescent and HID are...
Maintenance Factor
Maintenance factor occurred by the aging or pollution of the lamp. It is the multiplier that expresses the decrease in...