Lighting Vocabulary

What the Heck Are These Guys Talking About Anyway?

Color Tem6a00d834515c5469e201a73daa021c970dperature  Light is measured in Kelvins ranging from 9000K (which appears to be blue) down to 1500K (which appears orange-red). Color temperatures of 4000K or more are considered cool, 3100K or less are considered warm. 5500K is closer to sunlight at noon.

Color Rendition (CRI) – The color appearance of an object when lighted. The higher the color rendering index (CRI), the less distortion of the object’s color. Scales ranges from 0 to 100. Higher number indicates less color shift.

Daylight Harvesting – Systems that use sunlight to offset the amount of electric lighting needed to properly light a space, in order to reduce energy consumption. This is accomplished using lighting control systems that are able to dim or switch electric lighting in response to changing daylight availability.

Electroluminescence –  An optical and electrical phenomenon in which a material emits light in response to the passage of an electric current.

Fixture Efficiency – How much of a lamp’s light gets out of the fixture. (A fixture that’s 90 percent efficient delivers 50 percent more light than one that’s 60% efficient.)

Foot Candles – The unit of measurement indicating how much illumination is reaching a surface.

High Intensity Discharge (HID) – Lamps with an intense point source of light. Today’s electronic HIDs use metal halide lamps with electronic ballasts.

Light-Emitting Diodes (LED) – The unsung heroes in the electronics world. A two-lead semiconductor light source that fits easily into an electrical circuit. Unlike
ordinary incandescent bulbs, they don’t have a filament that will burn out, and they don’t get especially hot. LEDs are illuminated solely by the movement of electrons
in a semiconductor material.

Lighting Power Density – Watts per square foot. This can vary by how a space is used and its occupancy.

Lighting Retrofits – A retrofit is a technology upgrade that makes a building’s lighting more energy efficient. Over time, these energy savings can be significant enough to
not only pay for the equipment, but may produce a return on investment.

Lumens – The total quantity of light produced by a lamp.

Metal Halide –  Lighting, developed in the 1960’s, and produced by a gaseous mixture of vaporized mercury and compounds of metals.

Photometric Analysis – Specialized 3D technology, which allows lighting technicians to evaluate a building’s layout and obstacles. This process is essential in determining
possible energy saving plans.

Solid State Lighting (SSL) – A type of lighting that uses semiconductor light-emitting diodes as sources of illumination rather than electrical filaments, plasma (used in
arc lamps such as fluorescent lamps), or gas.

Wireless Lighting Controls This is exactly what it sounds like. Wireless dimmers and adaptive-controls that enable customers to eliminate over-lighting and greatly
enhance savings.