From an architectural perspective, daylight enters an interior through this which includes windows and skylights.
What is apertures?
100
The intensity of a light source, measured in candelas.
What is Candlepower?
100
Result of a lamp having to start again because of a power interruption or reduction in voltage.
What is Restrike?
100
Commonly referred to as a light bulb, a lamp is a source that produces optical radiation.
What is Lamp?
100
A control device used with an electric-discharge lamp to start the lamp and control the electrical current during operation.
What is Ballast?
200
The integration of daylight into interiors and is vital to creating quality and sustainable environments.
What is daylighting?
200
The operational time of a lamp expressed in hours.
What is Lamp Life?
200
Semi-conductor device consisting of a chemical chip embedded in a plastic capsule. The light is focused or scattered by lenses or diffusers.
What is Light-Emitting Diode (LED)?
200
The integration of daylight into interiors by gathering light through the roof of a building.
What is Toplighting?
200
An electric-discharge light source that generally uses electrodes, phosphors, low-pressure mercury, and other gases for illumination.
What is Fluorescent Lamp?
300
Capturing daylight for the purpose of illuminating interiors and saving energy.
What is Daylight Harvesting?
300
A rating based upon the lumens per watt consumed, reflecting the energy efficiency of a lamp.
What is Efficacy?
300
A conductive material used as a filament to heat because of its high melting and low evaporating points.
What is Tungsten?
300
The SI unit of measurement of luminous intensity. One candela represents the luminous intensity from a source focused in a specific direction on a solid angle called the steradian.
What is Candela (cd)?
300
Electric-discharge lamp with a light-producing arc stabilized by a bulb temperature, including mercury, metal halide, and high-pressure sodium.
What is High-Intensity Discharge (HID) Lamp?
400
The desirable natural light in a space.
What is Daylight (Skylight)?
400
A rating that describes the amount of electricity consumed for a given amount of illumination.
What is Lumens Per Watt (lpW)?
400
The operational process in which evaporated tungsten is redeposited on a halogen lamp's filament.
What is Halogen Regenerative Cycle?
400
The integration of daylight into interiors by gathering light through the walls of a building.
What is sidelighting?
400
A high-intensity discharge lamp that uses sodium vapor for illumination.
What is High-Pressure Sodium (HPS) Lamp?
500
Light that enters a space directly from the sun. This type of light is generally not good lighting for an interior. It can produce glare and excessive heat, and it can cause materials to fade.
What is Sunlight?
500
The amount of illumination produced by a lamp, measured in lumens.
What is Light Output?
500
Incandescent lamp that contains halogen.
What is Tungsten-Halogen Lamp?
500
The SI unit of measurement of luminous intensity. One candela represents the luminous intensity from a source focused in a specific direction on a solid angle called the steradian.
What is Candela (cd)?
500
Electrical light source that produces illumination without filaments and operates on low or high pressure. An electric current passes through a vapor or gas.