A feature that allows the fixture … As the name suggests, this is a track that functions at a low voltage using a step-down transformer. Lighting products with the ENERGY STAR have been tested for superior energy efficiency. Every lamp type has a unique lumen depreciation curve depicting the pattern of decreasing light output. For example, if the LLF is 0.80 and a room needs 40,000 lumens, the lighting system will be designed to provide 50,000 initial lumens (50,000 lm x 0.80 = 40,000 lm). Since lumens describe lighting output better than watts, efficacy tends to be a much more useful concept in lighting design. It is typically suspended from a canopy by 3 or 4 chains or rods. Having a high R9 quality is important in restaurant, retail, hospital, and art gallery applications. Disability glare impairs vision, but does not cause the same reaction as discomfort glare. formId: "7a6ba076-8bae-413c-a66f-0f6ac80b40da" Induction lighting has a much longer service life than HID or fluorescent lighting because there are no electrodes being subject to wear each time the lamp is activated. Lamps operating in positions for which they are not designed generally suffer reduced performance or short-term failure. The rate at which a lamp is able to convert power (watts) into light (lumens), expressed in lumens per watt (LPW or lm/W). Custom lighting rebate programs offer incentives for projects which do not meet the requirements of the existing instant or prescriptive rebate programs. The first digit indicates protection against solids, and the second indicates the protection degree against liquids. Halogen lamps also provide brighter, whiter light with better color characteristics, longer life and improved energy efficiency. A ballast that complies with ANSI standards. Ratio of scotopic to photopic lumens for a specific light source. STUDY. Manufacturers use 3 hours per start for fluorescent lamps and 10 hours per start for HID lamps when performing lamp life testing procedures. The IEEE is a technical authority that has published many standards and recommended practices for the electrical and electronic fields. For example, a 3000-lumen lamp connected to a ballast with a BF of 0.90 or 90% will produce 2700 lumens (3000 lm x 90% = 2700 lm). A type of lighting fixture that offers superior energy efficiency, by using a specially-designed LED array and internal geometry. Warm light sources, such as incandescent lamps, have a low color temperature (2000-3000K) and feature more light in the red/orange/yellow range. formId: "57ebcd10-bfe2-43a8-a2f8-93068502c170" IESNA has members and recognition throughout the world. Non-shunted sockets have contacts that are not joined/connected. A luminaire includes the lamp, the ballast or driver, internal wiring, reflectors, lens and any additional components required to deliver light. Match. A label placed by Underwriters Laboratories, which means a product has been tested for fire safety and electrical safety. Viewing angle beyond with it is no longer possible to see a light source directly, measured from the direction exactly below the lamp (nadir). Decorative lighting that is part of a building’s design and construction. Bulb (Light Fixture) A glass vessel that produces light when an electric current passes through it. Lighting where more than 90% of the light goes directly from the source to the area you wish to illuminate. Some lamps have built-in ballasts or drivers, while others are connected to an external one contained in the fixture. Also known as E26 or standard base, it is the screw-shaped base used by most residential light bulbs. Learn more about R9 color rendering value here. These lighting fixtures are installed into the ceiling and are in direct contact with insulation. Measurement unit for electric current. A three letter system that has been devised to describe lamps of different manufacture but the same application. Lighting systems designed for ceiling heights of 25’ or more, commonly found in sports complexes, warehouses or industrial locations. It is usually expressed in candles per square inch or Lamberts or foot Lamberts. A lamp can refer to a light source, such as a light bulb, or to a light fixture that creates light. Some LED lamps have a built-in driver, while others require one to be connected externally, just like the ballasts used by fluorescent and HID lamps. These rebate programs may also offer more lucrative incentives on the same applications, but there are typically a lot of variables and complexities to sort through to get to those larger incentives. The control for an electrical device. For example, if the socket is in the ceiling, pointed toward the floor, the lamp will be base up. Common term for the housing of a recessed downlight. The ratio of luminous flux emitted by a luminaire to that emitted by the lamp or lamps used within. Cove lighting is often used for decorative purposes because it can emphasize the borders of walls, as well as ceiling features. The CU is influenced by the luminous efficiency of the fixture, as well as room geometry and colors. A ceiling lighting fixture that has a stem that separates (or creates a visible gap between) the light from the ceiling. Acronym for high-pressure sodium, a subtype of HID lighting where excited sodium vapor is the source of light. Used to describe a power supply where the flow of electricity always takes place in the same direction, such as that provided to LED arrays by their drivers. Magnetic ballast are heavier and less efficient than their electronic counterparts, and issues with flickering or humming are common. Lighting configuration where several fixtures are mounted on a common track, which provides them with power and allows each of them to be oriented in a different direction. Occupancy sensors are an effective energy-saving measure. This is a common specification for HID lighting. A lighting maintenance plan designed to have a technician check lighting on a regular interval to check for outages or necessary repairs. Lamps are rated in watts to indicate power consumption. A numeric code that describes the degree of protection offered by an enclosure, according to the NEMA 250-214 standard. Lighting fixture that produces a narrow downward beam, generally used for accent lighting or task lighting applications. White light that is characterized by a yellow tinge. These incandescent lamps need a step-down transformer to bring the voltage down from 120 to 6, 12 or 24 volts. HEP lighting offers a very high efficacy (over 90 lumens per watt) and perfect color rendition (CRI = 100). Acronym for organic light-emitting diodes, flexible polymers based on organic carbon molecules, where the light source is spread across a surface as opposed to a point source. Swivel. Typically, this causes a buzz or a hum. Any lighting output emitted in unwanted directions, which may have negative consequences. A subtype of fluorescent lamp where a fluorescent tube is bent into a circular shape, and where the ballast is typically located in the middle. A recessed lighting fixture, designed to be installed in an opening in the ceiling. An interior design approach where several types of lighting are combined to achieve a specific ambience or mood. An example is the lighting provided by torchiere fixtures, which emit their beam towards the ceiling to be reflected back down. A device that uses infrared or ultrasonic radiation, or sound, to detect the presence of humans and switch the lights accordingly. This is the most energy-efficient starting method for fluorescent lamps. The beam angle is measured between the downward direction, where the lamp provides maximum lighting intensity, and the direction in which intensity drops to 50%. Find the housing that suits your needs: New-construction housing is used before the ceiling is … A piece of glass or acrylic that has the purpose of scattering the light from a bulb, which results makes lighting more uniform and eliminates glare. Also referred to as dimmer switches, light transformers are electrical devices that are used to change the voltage of a circuit to make the light dimmer or brighter. Halogen lamps are around 25% more efficient than their incandescent counterparts. A specific type of fluorescent lamp that has a tubular shape and comes equipped with pins at its ends, to be connected to the voltage output of a magnetic or electronic ballast. Some examples of HID lighting are mercury-vapor, metal-halide, xenon, high-pressure sodium and low-pressure sodium lamps. Lights for portions of the ceiling that are lower than the primary surface; for example, the fixtures installed above the kitchen sink or on a beam or the underside of a balcony. A ballast that preheats the electrodes of a fluorescent lamp before igniting it, which reduces their wear over time and extends the service life of the lamp. The horizontal plane where activities are carried out, typically 30 inches above the floor. }); hbspt.forms.create({ Light is a form of radiation, including infrared and ultraviolet light, which are invisible for humans. The brightness of an object or surface, as perceived by human eyesight from a specific direction. Fixture Parts Terminology. The resulting “colorfulness” when objects are exposed to a light source, compared to that resulting from natural lighting. Each lighting circuit is connected to a circuit breaker, and it interrupts current automatically if an overload or fault is detected. A troffer-type luminaire that is covered by a lens, making the lighting distribution more uniform and eliminating glare. Glossary of Typical Lighting Terms AMPERE: The standard unit of measurement for electric current that is equal to one coulomb per second. Bollards generally accomplish a double function, providing both outdoor lighting and decoration. A type of electromagnetic radiation, invisible to the human eye (i.e., beyond the visible spectrum) with a wavelength of 10 to 380 nanometers. A progressive reduction in the luminous output of a lamp throughout it service life. 2700K, with a warm tinge of yellow that creates appealing and relaxing environments, 4000K, a neutral white tone that strikes just the right balance between relaxation and concentration, 6500K, with a slight tinge of blue, which has an energizing effect. Multiple LEDs (light-emitting diodes) aligned in a single strip and used for creating uninterrupted lines of directional lighting. This is only a quick review of lighting terminology for the theatre. The shielding or diffuser portion … A measure of the rate of flow of electricity expressed in amperes. }); hbspt.forms.create({ An electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides (compounds of metals with bromine or iodine). Unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candle intensity or equal to one lumen per square meter. Lighting located above, below or to the sides of a bathroom mirror. The term is generally used for lighting with a correlated color temperature (CCT) of around 3000K. A base up lamp must be inserted into a socket with the base of the lamp pointing up (vertical orientation). A lighting design strategy that maximizes the use of natural light to reduce energy costs and create indoor spaces that feel natural and appealing. Is measured in Kelvin and indicates whether a lamp has a warm, midrange or cool color appearance. A factor used in lighting calculations to account for the light loss that takes place in a lamp due to the gradual decay in lumen output over a specified period of burning time. The cave effect is generally unwanted because it makes indoor spaces feel ominous, like the interior of a cavern. A group of LEDs mounted on a printed circuit board, capable of producing a lighting output. The term is commonly used in theatrical lighting, to describe the angle between the stage lighting direction and the viewer’s line of sight. MR lamps are available with both screw bases and pin bases. Lamps that have two bases opposite one another. Lighting designed to provide visibility when the normal lighting system fails, for example during blackouts. Acronym for solid state lighting, any type of lighting that uses LEDs to produce light, instead of incandescent filaments, ignited gas or plasma. Integrated lighting fixtures are generally more efficient than lamp-based LED fixtures, but they make retrofits more expensive because the entire fixture must be replaced, not only the lamps and ballasts. portalId: "455757", Energy Policy Act, a 1992 law that established minimum efficacy requirements for incandescent and fluorescent lamps, a well as labeling requirements. Voltage drives electric current through lighting fixtures and other appliances, just like pressure drives the flow of water in plumbing installations. These are often designed for series electrical connections, mechanical mounting and heat dissipation. For example: National Institute of Standards and Technology, a US-based physical science laboratory that is a technical authority on standards, measurements and technology. It is important to note that the term does not refer to actual daylight, but rather artificial lighting that replicates its color. Mercury lamps may use a phosphor coating to enhance lighting performance, and are commonly used in outdoor and industrial lighting applications. Any serious student of lighting design will study the complete glossary of terminology found in many theatrical lighting … I The first number indicates the protection against solid particles, ranging from 0 to 6. A subtype of ballast that uses power electronics to provide a high-frequency voltage and controlled current for fluorescent lamps. Write. A fluorescent lamp uses electrodes to stimulate mercury vapor and produce ultraviolet (UV) radiation, which in turn stimulates the phosphor coating of the lamp to produce visible light. To calculate beam spread, multiply beam angle by 0.18 by distance of surface from light source. That invisible UV light illuminates the phosphor powder coating the inside of the glass tube, emitting white “fluorescent” light. Not to be confused with luminous intensity. National Association of Innovative Lighting Distributors, a lighting industry association that provides ongoing training, a discussion forum, networking, business intelligence and information services. Created by. Rapid start ballasts apply a low filament voltage to preheat the cathodes in a lamp. A lamp that has an integrated ballast, allowing direction connection to the supply voltage. Click the word below to see the definition. A lamp and fixture can only be used together if the lamp base matches the fixture socket. A compact lighting fixture that directs its output downward, hence its name. Ballast factor divided by input power (watts). The wire coil that is heated to produce lighting in incandescent and halogen lamps, normally made from tungsten. Light arriving at a surface, expressed in lumens per unit area. 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