There are two types of glare: A light source that creates shadows with a very sharp edge when cast on objects. IESNA has members and recognition throughout the world. The part of a lighting fixture that provides support and power for a lamp with a matching base. Lumen output of a light source after the source has been used. Test. American National Standards Institute, a publisher of standards for US products and services. In the BUG rating, these effects are indicated in a scale from 0 to 5, where 0 indicates the effect is minimized and 5 indicates it is not controlled at all. The specific component of a lighting fixture that emits light. A fill light illuminates the shadows that are created by the key light. Fixture Parts Terminology. IESNA standard that establishes the procedure to test the lifespan of LED lighting. formId: "04389d6a-7afd-414c-8b1c-9a9efd6f8550" STUDY. If the colors appear more intense, the light source saturates them; on the other hand, if colors are dulled, the light source desaturates them. Used to compare ballast efficiency. Procedure of determining the current drawn by a lighting fixture or a circuit consisting of multiple fixtures. Depending on their internal construction, ballasts can be either magnetic or electronic. Fluorescent tubes with a higher lumen output and rated power than conventional fluorescent tubes. Electronic ballasts are lighter and more efficient than magnetic ballasts, and they eliminate humming and flickering issues. BUG is an acronym for backlight, uplight and glare, and the term was developed by the Illuminating Engineering Society (IES) and International Dark-Sky Association (IDA) to describe the amount of light emitted by a fixture in unwanted directions. U-bend lamps generally have two bases, one on each end, which attach to different lampholders. Time required by an HID lamp to achieve full brightness after it has been turned off. Utilizing retractable functionality, this recessed downlight pulls down from the ceiling to aim at various angles. The shielding or diffuser portion … A label placed by Underwriters Laboratories, which means a product has been tested for fire safety and electrical safety. Before delving into the different equipment and techniques, let's look at a few basic terms used in stage lighting. Most high-pressure sodium and mercury lamps are measured at 50% of their rated lives. The wire coil that is heated to produce lighting in incandescent and halogen lamps, normally made from tungsten. Cool light sources, such as some HID or fluorescent lamps, have a high color temperature (>5000K) and feature more light in the blue range. Distance between the bottom of the fixture and the work plane. Depending on the application, mounting height can have two possible definitions: MR is an acronym for multifaceted reflector, a component used to shape the output of a light bulb into a directional beam. An effect that occurs when lighting fixtures direct all of their lighting downward and little or no light is reflected back up towards the ceiling or upper wall portions. A type of CFL lamp where two parallel fluorescent tubes share the same base. Acronym for light-emitting diode, a solid-state component that emits light when exposed to electric current. A troffer-type luminaire that is covered by a lens, making the lighting distribution more uniform and eliminating glare. Dimming method where the lamp output can be adjusted at any level between OFF and 100% output, without incremental steps. National Association of Innovative Lighting Distributors, a lighting industry association that provides ongoing training, a discussion forum, networking, business intelligence and information services. Lighting with color pumping technology enhances the perceived colors of the items displayed under its light. This provides a single track for the electrical current to travel from the ballast, through the tombstone, or socket, and to the lamp’s pins. For example, some lamps can only operate in the base-up position. A type of lamp base that connects with the socket using keyways instead of threads. The decrease in lumen output of a light source over time. This is only a quick review of lighting terminology for the theatre. 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). 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