Lighting Glossary

Polymethyl methacrylate (PMMA) is a transparent and rigid thermoplastic material. PMMA is also known as acrylic, acrylic glass and plexiglass. It is widely used in the production of lenses, diffusers and light guides in the lighting industry, as it provides high light transmittance.

PAR is an abbreviation formed from the initials of the words Parabolic aluminized reflector. PAR lamp is a type of lamp widely used in commercial buildings, residences and transportation vehicles. PAR lamps are used in the headlights of old vehicles, exterior lights of vehicles such as trains and airplanes, and...

LED is a durable lighting technology that provides high light output with low energy consumption. This technology requires special power supplies to work. LED driver is a electronic device that provides required voltage and current to LED or LED array to work.

Illuminance or light level is the total amount of light per unit area on a surface. Its unit is lux and is used in abbreviated form as lx. How much an environment is lighted-up expressed by the value of lux. It can be said that the higher the value of...

Devices that provide the appropriate voltage and current needed to operate gas-discharged lamps, such as fluorescent and HID, are called ballast. The ballast limits the current transmitted to the gas discharge lamps, thus preventing the lamp from deteriorating by attracting high current.

Decorative lights designed to be mounted on the ceiling or wall, usually containing more than one lamp in the body, are called chandeliers. Chandeliers are used in almost every corner of the house, in all living areas.

LED chips that come out from mass production have some minor differences such as light color, light output, and operating voltage. The work of grouping LEDs and assembling those with similar properties in a group is called Binning.

CE marking indicates that a product has the relevant health, safety and environmental protection requirements according to European Union (EU) legislation. The official CE marking consists of the letters C and E in circle form.

The maintenance factor is multiplier, which refers to the decrease in light output caused by aging or contamination of the lamp. The maintenance factor refers to the light losses that occur over time and is also known as the loss factor.

The lighting unit which contains one or more electric light sources and all the parts necessary for its operation is called a fixture. Fixture provides necessary protection to light source and other equipments and controls light distribution.