glossary

Find easy to understand definitions for terminology so Sharp product features and Sharp benefits are clear to you. Click below on the first letter of the word you want defined.

  • Lamp

    Refers to any man-made source of light, including incandescent, fluorescent, and LED products. It is also know as a “light bulb”.

  • Lamp Life

    In LED lamps, it is the calculated amount of time that a lamp will burn at 70% of initial light output or higher, using the specifications of the LED components, the junction temperature v. ambient temperature.  Currently most LED lamp applications today are estimated to have life of 15,000 hours to 50,000 hours.  However, these applications will continue to generate light for longer, but with fewer and fewer lumens.

  • LCD

    Principle – When voltage is applied to liquid crystal molecules that are sandwiched between two panels, molecules that are arranged horizontally to the panels begin to rearrange themselves vertically. When light is emitted from one of the panels, it passes through the vertically arranged liquid crystal molecules, and reaches the other panel, which emits light. This is like light shining into a room from the top of a set of blinds. When the slats are open, you can see through the blinds and see the sunlight on the floor. However, when the slats are raised, light is blocked and the floor becomes dark. In this way liquid crystals are similar to the slats in blinds.

  • LCD TV

    LCD allows screens to be thinner, and televisions lighter and more energy efficient than ever before. The result is television that not only can fit flat on a wall, it can fit in places conventional televisions cannot.

  • LED

    See Light Emitting Diode.

  • LED Array

    An assembly of LED packages on a printed circuit board or substrate, possibly with optical elements and additional thermal, mechanical, and electrical interfaces. The device does not contain a power source and does not have an ANSI standardized base.

  • LED Die

    A small block of semiconducting material on which a diode circuit is fabricated.  Diode circuits usually are produced in large batches on a single wafer of electronic-grade material. The wafer is cut (“diced”) into many pieces, each containing one copy of the diode circuit. Each of these pieces is called a die. There are three commonly used plural forms: dice, dies, and die. Typically LED die are 1mm2 or smaller.

  • LED Driver

    A power source with integral LED control circuitry designed to meet the specific requirements of a LED lamp or a LED array.

  • LED Lumen Maintenance (L70)

    Defined by US DOE as the standard for measuring lifetime.  It is the length of time declared by the manufacturer at which 70% of lumen output is still maintained after continuous burning.

  • LED Luminaire

    A complete LED lighting unit that consists of a light source combined with a driver and parts to distribute the light, to position and product the light source, and to install the light source in a socket or fixture.  The light source itself may be an LED lamp, an LED array or an LED module.

  • LED Module

    One or more LEDs in an LED light source that also may include electrical, electronic, optical and mechanical components.   The LED module may be connected to the load side of an LED power source or LED driver, but does not contain an integrated power source.

  • LED Package

    An assembly of one or more LED dies that contains wire bond connections, possibly with an optical element and thermal, mechanical, and electrical interfaces. The LED package typically provides optical, thermal and mechanical assembly options that enhance the performance of the LED die. The device does not include a power source and does not include an ANSI standardized base.

  • Ledger Size

    Paper measuring 11" x 17". Also known as tabloid size.

  • Lens

    The glass or plastic part of a luminaire (light fixture) used to control the direction and distribution of light.

  • Letter Box (4:3 LB)

    The screen image is altered so a widescreen image (16:9) can be displayed on a standard (4:3) TV.  The displayed image will have black bars on both the top and bottom of the image.
  • Light

    Radiant energy that can be sensed or seen by the human eye.  Visible light is measured in lumens.

  • Light Emitting Diode (LED)

    An electronic light source, based on the semiconductor diode.  When the diode is switched on, electrons recombine with holes and energy is released in the form of light.  This effect is called electroluminescence and the color of the light is determined by the energy gap of the semiconductor.  LEDs are available that can emit visible, ultraviolet or infra red wavelengths, with very high brightness.  The LED die is usually small in area (usually less than 1 mm2) and it is packaged with integrated optical components to shape its radiation pattern and assist in reflection and heat dissipation.

  • Light Engine

    An LED light source, optic and heat sink integrated into a single module.  Also see LED module.

  • Light Fixture

    A complete lighting unit, including housing, diffuser, wiring, socket, ballast, reflector, and lamp; the more frequently used name for Luminaire.

  • Light Source

    Also known as "lamp."

  • Lumen (lm)

    A unit of luminous flux, a measurement of the total light energy emitted by a light source per unit of time as perceived by the human eye.  A standard 60-watt incandescent lamp provides approximately 800 lumens.

  • Lumen Depreciation

    The decrease of lumen output of a light source over time.

  • Lumen Maintenance

    A measurement, expressed as a number or as a graph, that indicates how well a light source maintains its light output over time.  For LEDs, it is the luminous flux measured at a given time in the life of the LED and expressed as a percentage of the initial luminous flux.

  • Lumens Per Watt (LPM)

    A ratio expressing the efficiency (luminous efficacy) of a light source.

  • Luminaire

    A complete lighting unit that positions and protects the lamps, connects them to a power supply, and distributes the light, and is often called a “Fixture” or “Light Fixture”.  It includes lamp(s), ballast(s), housing, diffuser(s), wiring, socket(s), and reflector(s).

  • Luminaire Efficacy

    The luminous flux of the luminaire divided by the input power.

  • Luminaire Efficiency

    The ratio of lumens emitted by a luminaire to the lumens emitted by the lamp(s) installed in that luminaire.

  • Luminance (L)

    Indicates the brightness of a light reflected in a particular direction.  Measured in candelas (units of intensity) per unit area (square foot or square meter).

  • Luminous Efficacy (lm/W)

    An important measure of LED performance; the efficiency of converting electrical power to light, as perceived by the human eye.  It is calculated by dividing the light output (lumens) of a light source by the total power input (watts) to that source.  The higher the efficacy, the lower the energy required to deliver a given amount of light, and depending on the carbon intensity of the electrical generation fuel mix, the lower the greenhouse gas emissions.

  • Luminous Flux

    The rate of flow of light energy as perceived by the human eye, measured in lumens.

  • Luminous Intensity (cd or mcd)

    A measure of LED performance; measured in candela (cd) or millicandela (mcd).  HB LED are capable of generating luminous intensities of at least hundreds of millicandela in a standard 5-mm lamp package.

  • Lux (lx)

    A measurement of light falling onto a surface.  1 lux =1 lumen per square meter.

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