Glossary

Term

Abbreviation

Definition

Alternating Current

(AC)

An electric current that reverses its direction at regular intervals.

Ampere

(A)

Unit of electric current. Equivalent to a steady current produced by one volt applied across a resistance of one ohm.

Color Rendering Index

(CRI)

Color Rendering Index is a measure of how well a light source is able to show the colors of an illuminated object. 100 is the best, and 0 is the worst. 80+ is referred to as high CRI.

Color Temperature

The degree of warmness or coolness of a light, measured in Kelvins (°K). Warm White is typically 3000°K and below, Neutral to Cool is around 3500-4000°K, and Daylight White is around 6500°K.

Color Tunable

Also referred to as White Adjustable, this type of lighting can be adjusted from warm white to cool white. These products are used in a variety of settings, and are becoming more popular as research shows that cool white lighting is best for focus and daytime activities, warm white lighting is best for relaxation and morning/evening lighting.

Diffuser

Diffusers are milky covers that are inserted into the channel above the LEDs. They protect the LEDs, give the fixture a finished look, and eliminate hot spots (brighter areas, which appear as dots) caused by the spacing of LEDs on a strip.

Direct Current

(DC)

An electric current flowing in one direction only.

Foot-candle

(fc)

The unit of measure for the density of light as it reaches a surface. One lumen per square foot. 1 foot-candle = 10.8 lux.

Halogen light

A white light produced by an incandescent filament lamp placed in a quartz capsule containing halogen. Halogens are an improvement on the incandescent light Thomas Edison commercialized over a century ago, but they still generate much more waste heat than light energy. To conserve energy, use LED lighting.

Light Emitting Diode

(LED)

A type of solid-state lighting in which light is generated by passing a current through a pn (positive-negative) junction in a semiconductor.

Lumen

(lm)

The quantity of luminous flux emitted within a unit solid angle (one steradian) by a point source with one candela intensity in all directions.

Luminous Efficacy

The light output of a source divided by the input power consumed by that source, in lumens per watt.

Lux

(lx)

The unit of measure for the density of light as it reaches a surface. One lumen per square meter. 1 lux = 0.093 foot-candles.

Maximum Overall Length

(MOL)

The distance from one end of the lamp to the other, usually in inches.

Phosphor

Chemical compound used to coat the inside of fluorescent, compact fluorescent and some metal-halide and mercury bulbs. Phosphors glow when excited by electrons.

Rated Lamp Life

The point at which half the lamps in a statistically-significant sample of tested lamps fails.

Red-Green-Blue

(RGB)

Product with three colors in each LED node. These three colors can be combined and controlled to create all other light colors.

RGB ColorPlus

(RGBW)

This LED strip alternates RGB LEDS with white or amber LEDs, for ultimate color mixing.

Volts

(V)

The MKS (meter-kilogram-second) unit of electrical potential difference and electromotive force equal to the difference in potential between two points in a wire carrying a constant current of one ampere when the power dissipated between the points is equal to one watt.

Watt-Equivalents

The number of watts an incandescent lamp would consume to produce a like amount of light generated by a compact fluorescent or other lamp-type. Example: a 10 Watt compact fluorescent typically produces the light of a 60 watt incandescent, or 60 Watt-equivalents. That’s why LEDs save about 75%-90% power to generate the same amount of light as incandescents, including halogens.

Watts

(W)

The metric unit of power equal to the work done at the rate of one joule per second or to the power produced by a current of one ampere across a potential difference of one volt.

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