A (AMPERE): The unit of measurement of current.

BEAM ANGLE: Viewing angle

BINNING: The process of separating LED chips based on their various characteristics and assigning them a specific bin code after matching similar chips. Small bins result in better color consistency.

CANDELA (CD): A unit ofmeasurement of luminous intensity,equal to the amount of light given out through a solid angle, that is to say lumens per steradian.

CCT: Correlated color temperature; A measure of the color appearance of a white light source. CCT is measured on the Kelvin absolute temperature scale. White lighting products are most commonly available from 2700K warm white,

CE: The CE symbol is affixed at the manufacturers’s responsibility and is not a safety symbol. The manufacturer uses it to document with European Union directives.

CHROMATICITY: Desciption of quality of a color regardless of its luminance Defined by x and y coordinates on the standard chromaticity scale developed by the CIE 1931.

CRI: Color Rendering Index; A measure that defines how well colors and rendered by different light sources incomparison to a standard light source. CRI is given as a number from 0 to 100.

DRIVER: A circuit that provides current to the LED. Constant current drivers are suitable for high power LED. Constant voltage drivers are suitable for low power LED.

HEAT SINK: A component designed to lower the temperature of the electronic device to which it is connected by dissipating excess heat generated. INPUT VOLTAGE (Vin) : The voltage applied to the driver circuit.

JUNCTION TEMPERATURE (Tj): Temperature of the p-n junction within the semiconductor die; key to ensurin long life of LEDs.

L70: Shorthand for 70% of initial lumen output; stated conversely, it indicates 70% lumen maintenance.

LED: Light Emitting Diode. A solid-state semi-conductor that converts electrical energy directly into light.

LENS: A secondary optic that collimates the light.

LUMEN (lm): The unit measurement of luminous flux equal to the light emitted in a solid angle by a uniform

LUMEN DEPRECIATION: The decrease in lumen output that occurs as a lamp is operated. Because LEDs cancontinue to operate at very low light levels, LED life is usually defined as lumen depreciation to a particular point, such as 70% of initial lumens.

LUMEN MAINTENANCE: The number of hours after which the light output will be at 70% of the original light output.

LUMINOUS EFFICACY: The ratio of luminous flux to watts/power;how well a light source provides visible light from a given amount of electricity.

LUMINOUS FLUX: The total amount of illumination emitted by a light source; measured in lumens.

LUX: The metric unit of illuminance. One lux is one lumen per square meter: lm/m2

mA: Milliampere; unit of electrical current

OUTPUT CURRENT (lout): The current supplied to the LED from the output of the driver. It is measured in Ampere.

OUTPUT VOLTAGE (Vout): The voltage available to the LED from the output of the driver.

PC: Phosphor Conversion; White light can be produced by a blue, violet or near-UV LED coated with yellow or multi-chromatic phosphors. The combined light emission appears white.

RGB: Red, Green, Blue; the three primary colors that make up white light. One way to create white light with LEDs is to mix the three primary colors of light.

SSL: Solid State Lighting; Lighting that uses solid-state devices.

VOLT. (V): The unit of measurement of voltage.

WATTAGE (W): The unit of measurement power. One Watt. is 1Ampere of current flowing at one voltage.

Source:GreenGroupic