Glossary of LED Lighting Terms & Products

A19 Bulb

Wikipedia describes the A19 Blub this way:

The A-series light bulb is the “classic” type of light bulb that has been the most commonly used type for general-purpose lighting applications since the early 20th century. It has a pear-like shape and an Edison screw base. The number that follows the “A” within the A series indicates the width of the bulb in one-eighth inch units or in millimeters. Order A19 Pack Here

Accent Lighting:

Directional lighting that is used to emphasize or highlight a particular pixs 052accent-lighting-03


The standard unit of measurement for electric current that is equal to one coulomb*, per second. It defines the quantity of electrons moving past a given point in a circuit during a specific period. Abbreviation – Amp * Coulomb – A unit of electrical charge is defined as the amount of electric charge transported by a current of 1 ampere in 1 second.


A device which is used to supply sufficient voltage to start and operate Fluorescent and HID lamps, while limiting and regulating the lamps current during operation.

Bayonet Cap Base:bayonet_cap_image

A type of lamp base with a pin on either side which locks the lamp into place when placed in the lamp socket.


Beam Angle:beam_angle_image

The degree of width that light emanates from a light source.


An outdoor light fitting that which is a very sturdy vertical post with the light source located at or near the top. Bollards are typically used to light up walkways in commercial areas.

Brick Lights:Led_brick-light.image

A light fitting that can be recessed in a brick wall, in order to light up a walkway, step a landing or a pathway.


Another term for a lamp.


An electrode that emits electrons*. A fluorescent lamp cathode emits or discharges electrons to the cathode at the other end of the lamp. * Electrons – An electron is a negatively charged component of an atom.

Cobra Street/Parking Light:

“Cobra Head” LED Street/Parking Lights are named for their shape and design. The old energy wasting styles (high pressure sodium fixtures, etc.) are often replaced with the new box like design. Some even are Solar driven to save even more costs! CLICK HERE to Order Now or CLICK HERE to Learn More!

Color Rendering Index:CRI__Color_Temp_image

Color Rendering Index also known as CRI, is a measure of the ability of a light source to reproduce the color of various objects faithfully in comparison with an ideal or natural light source. The CRI simply rates the color rendering out of 100, the higher the index the better the color rendering.

Color Temperature:

Color temperature is a measure of how warm or cool the light given off by a lamp appears. ‘Warm’ colors appear tinged with yellow and generally feel soft and cozy. Cool colors are tinged with blue and appear whiter; making them a more ‘honest’ and unforgiving light more suitable for working environments than relaxing. The way to measure light is through the Kelvin Temperature scale.

Compact Fluorescent Lamp:cfl_images

Compact Fluorescent lamp also known as CFL are often used as an alternative to incandescent lighting. They have a high color rendering and a lamp life of about 5 times longer than incandescent lamps.


Cove Lighting:LED_builder_cove_lighting

Cove lighting is a form of indirect lighting built into ledges, recesses, or valences in a ceiling or high on the walls of a room.


A translucent piece of glass or plastic sheet which shields the light source in a fixture. The light transmitted throughout the diffuser will be redirected and scattered.


A device in an electrical circuit used for varying the brightness of lamp in a lighting installation.

Direct Current:

A Direct Current also know as DC, is an electric current that has no alterations.


The DesignLights Consortium™ promotes quality, performance and energy efficient commercial sector lighting solutions through collaboration among its federal, regional, state, utility, and energy efficiency program members, luminaire manufacturers, lighting designers, and other industry stakeholders throughout the US and Canada. The DLC is a project of Northeast Energy Efficiency Partnerships (NEEP), a regional non-profit which has been bringing stakeholders together since 1996 to accelerate efficiency solutions to create lasting change in the marketplace. CLICK HERE for more Details!


A light fixture which is usually completely recessed into the ceiling that concentrates most of the light in a downward direction. It may feature an open reflector and/or a shielding device.

Driver, (LED) Internal or External:

They power supplies that are just like ballasts for fluorescent lighting. They take the line voltage (120-277) and convert it to 24 volts needed to run the LED lamps.LED_internal_drive_imageled_External_driver_image

Edison Base (Screw-In):



A lamp base that screws into it’s matching socket when rotated clock wise.


A metric used to compare light output to energy consumption. Efficacy is measured in lumens per watt.

Electronic Ballast:

A ballast that uses semiconductor components to increase the frequency of fluorescent lamp operation.


ENERGY STAR is a U.S. Environmental Protection Agency (EPA) voluntary program that helps businesses and individuals save money and protect our climate through superior energy efficiency. The ENERGY STAR program was established by EPA in 1992, under the authority of the Clean Air Act Section 103(g).


Variation in light intensity due to 50 Hz operation. This can cause eye strain and fatigue due to stroboscopic effects.


A broad-beamed, high intensity, artificial light source generally used for industrial and commercial applications.

Fluorescent Lamp:Fluorescent_Lamp_images

A light source consisting of a tube filled with argon, along with krypton or other inert gas. A phosphor coating on the inside of the glass tubing transforms some of the ultraviolet energy created inside the lamp into visible light when electrical current is applied.


The English unit of measurement of the illuminance (or light level) on a surface. One foot-candle is equal to one lumen per square foot.


The number of times per second that an alternating current system reverses from positive to negative and back to positive, expressed in cycles per second or hertz (Hz).


Direct glare is caused by light coming directly to the eye from a light source. Indirect glare is light reflected from a surface in the direction of the eye. Both can harm vision and cause visual discomfort, annoyance or loss of visual performance.

GU10 Base (Lamp):led_gu10_images

These lamps have a turn-and-lock base, so they cannot be accidentally interchanged with low-voltage lamps. Their filaments are finer and they are much more fragile than those used in low-voltage lamps and have a far less lumen output than the low voltage lamps. LED lamps have been developed as GU10 to be operated directly on mains voltage, but unlike Halogen types, they perform the same as low voltage lamps. They can house electronic drivers direct off the mains power and can perform more efficiently and can also be made dimmable using standard residential phase cut dimmers.

Halogen Lamp:Halogen_lamp_image

A type of incandescent lamp that contains halogen gases, which slow down the evaporation of the tungsten filament.



Lighting used in Industrial applications where the ceiling height is greater than 20 feet.

High Intensity Discharge Lamp (HID):hid_lamp_image_High Intensity Discharge Lamp

High Intensity Discharge lamp, also known as HID, is a generic group of lamps consisting of mercury, metal halide and high pressure sodium lamps.


The amount of light arriving at a surface, expressed in lumens per unit area; 1 lumen per square foot equals 1 foot-candle, while 1 lumen per square meter equals 1 lux.

Kelvin Temperature scale:LED_Cplor_Temp_Chart

The way we measure light is through the Kelvin Temperature scale. This standardized color scale is created by heating a theoretical black body, starting out at zero degrees Kelvin (Absolute zero) as the body heats up, it glows, like any other object would. As the heat increases the color changes, appearing first dark red then yellow, moving through the visible colors of the spectrum until it reaches blue and violet.

Light Emitting Diode (LED):

Light Emitting Diode, also known as LED, a small electronic device that lights up when electricity is passed through it. LED’s have a very long life and come in a variety of colors, the most common are Warm White, Cool White, Red, Green and Blue.


Low voltage lighting systems usually operate on 12 volts and 24 volts. Low voltage lighting systems uses a transformer (electronic or magnetic) to transform the “incoming” voltage (usually 240 volts) to 12 or 24 volts.

Lumen:lumens Light Output LEDs Incandescents image

A unit of light flow. The lumens rating of a lamp is a measure of the total light output of the lamp * Lumens values are approximate, they may vary due to different manufacturers.


The metric unit of measurement for illuminance of a surface. One lux is equal to one lumen per square metre.

Mercury Vapor Lamp:Mercury Vapor Lamp image

A type of high intensity discharge (HID) lamp that uses mercury in an excited state to produce light, most of which is produced by radiation from mercury vapor.


Metal Halide Lamp:Metal_Halide_pixs

A HID lamp that produces light by radiation from certain metallic vapors when supplied with electricity from a ballast.

MR16 Lamp:led_MR16 Lamp image

MR16 lamps contain single-ended quartz halogen filament capsules with a multifaceted reflector (MR); a pressed glass reflector with the inside surface composed of facets and covered by a reflective coating. These facets provide optical control by gathering the light from the filament to create a concentrated beam of light. The reflective coating can be either Dichroic or Aluminum. Most MR16 lamps are operated using voltages lower than 120 volts, typically 12V. MR16 lamps can be dimmed through commercially available dimmers for low voltage loads.

PAR Lights (Cans) Size Definition:

The number used to represent the size of the can or bulb is 1/8 of an inch, and this goes for the LED or regular bulbs as well as the PAR cans themselves. For example: A PAR 64 can is able to support a bulb that is 1/8th of 64, or 8 inches, in diameter. You’ll need to know this to order the correct size light.

Pendant Lighting:led Pendant Lighting image

Pendant Lights can provide both task and general lighting, equipped with shades or globes to avoid glare. They are suspended from the ceiling over dinette tables, kitchen counters or other work areas.


The rate at which energy is taken from an electrical system or dissipated by a load, expressed in watts (W); power that is generated by a utility is typically expressed in volt-amperes (V-A).

Reflector:led Reflector image

A device used to redirect the light by the process of reflection.


A device used with a ballast to start and preheat fluorescent lamps.


An electrical device that transforms the line voltage of a facility into the voltage that a low voltage lighting system requires. For Example: In a building there are usually at least one or two transformers that convert the incoming voltage (13,500) to 120/277 needed for the building. Sometimes there are multiples so that there is no line loss between floors with the full voltage supplied to each floor and then stepped down.

Underwriters Laboratories:UL_logo

UL (Underwriters Laboratories) is a premier global safety science company with more than a century of proven experience, from the public adoption of electricity to new breakthroughs in sustainability, renewable energy and nanotechnology.


A volt is the potential difference that will cause 1 ampere to flow through one ohm resistance.


The standard metric unit of measurement for electrical potential. It defines the force or pressure of electricity.

Wall Packs:

Wall Pack Lighting offer a guide for walkways and act as an architect’s ambassador to the design of their buildings lines at night. CLICK HERE!
Watt is the unit for measuring electrical power. It defines the rate of energy consumption by an electrical device when it’s in operation. It is defined by the current voltage. The energy cost of operating an electrical device is calculated as its wattage times by the hours of use.


Lowest Price Leds .net has compiled this list of terms for your convenience.



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