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This information is in alphabetical order. Click on the initial of the subject you are interested in, for example, "F" for fixture. You may have to scroll to see the entry you want.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
ANSI (American National Standards Institute) - Group that generates product performance standards for many U.S. industries.
ARC - Intense luminous discharge formed from passage of electric current across a space between electrodes.
ARC TUBE - Completely sealed quartz or ceramic tube where an electrical arc occurs and generates light.
[an error occurred while processing this directive]BALLAST - Device that, by means of resistance, inductance, capacitance/electronic elements, singly or in combination, controls current, voltage and waveform to required values for proper lamp starting and operation for a HID ballast operating at given supply voltage.
BALLAST LOSSES - Power which is supplied to the ballast but not converted into light energy.
BURNING POSITION - Position that lamps are designed to operate.
CAPACITOR - Device in ballast that stores electrical energy.
COLD START TIME - Amount of time from application of ballast voltage to ignition of arc discharge.
CONSTANT WATTAGE AUTOTRANSFORMER (CWA) BALLAST - Auto transformer lead ballast circuit using a capacitor in series with the lamp; compared to other ballasts, the CWA regulates over a wider input voltage range, holding lamp wattage to a narrow range.
CORE & COIL BALLAST - Term for electromagnetic ballast.
CURRENT CREST FACTOR - Ratio of the peak to RMS value of lamp current; metal halide values range from 1.4 - 1.8.
DISCHARGE LAMP - Light-producing device that depends on electric arc, rather than filament, to create illumination.
ECONOMIC LIFE - Number of hrs. a group of lamps will burn before it's ergonomically advisable to group re-lamp (typically 60%-75% of rated life).
ELECTRONIC BALLAST - Ballast that, with aid of electronic components, transforms current at high frequency to operate discharge lamps.
EMI (ELECTROMAGNETIC INTERFERENCE) - Electrical interference with radio communications, defined by Federal Communications Commission (FCC).
ETL - Independent electrical testing laboratory which performs ballast testing.
FOOT CANDLES - Measure of light level on a surface which is being illuminated.
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HID - High Intensity Discharge; includes metal halide, mercury vapor and high pressure sodium.
HIGH POWER FACTOR BALLAST - Ballast designed so that input power factor isn't less than 90% when ballast is operated at center-rated voltage using proper reference lamp.
HIGH REACTANCE AUTOTRANSFORMER (HX) BALLAST - Autotransformer lag circuit that uses magnetic shunt path between primary and secondary coils to control reactance.
IGNITER - Electronic device that provides, by itself or in combination with other circuit components, the appropriate electrical conditions to start a discharge lamp.
INITIAL LUMENS - Lumen level of lamp after it has been operating 100 hrs.
INPUT VOLTAGE - Voltage, provided by power line/power supply, which the ballast uses to provide proper level to power lamps.
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LAMP VOLTAGE - Voltage which lamps operate when they are fully warmed up.
LOW POWER FACTOR BALLAST - Ballast that requires about twice the line current of high power factor ballast.
LUMEN MAINTENANCE - Lumen output provided by a lamp at given point in or percentage of it's life.
LUMENS - Amount of light lamp emits once it's started.
MEAN LUMENS - Average light produced when lamp has been operating about 40% of rated life.
NORMAL (LOW) POWER-FACTOR BALLAST - Ballast of multiple-supply type that doesn't have means for correcting input power factor.
OCCUPANCY SENSOR - Control device that dims/turns lights off after space becomes unoccupied; may be ultrasonic/ infraredactuated.
CIRCUIT VOLTAGE BALLAST (OCV) - Voltage across output terminals of ballast when no load is connected (RMS, unless otherwise stated)
RATED LAMP (MEDIUM BASE) - Designed forfixtures; has narrower neck than standard medium base lamps to fit into an exclusionary medium socket forfixture use.
RATED LAMP (MOGUL BASE, EX39) - Has extended contact pin on bottom of base; can only be used withfixture mogul sockets designed to prevent electrical contact if unshrouded, standard base lamps are used.
OPERATING CURRENT (LINE) - RMS current measured through input terminals of ballast which is operating a reference lamp.
POSITION ORIENTED MOGUL BASE (POMB, EP39, EP40) - Used with horizontal burning lamps; has aligning pin embedded in base for proper lamp orientation.
POTTING - Plastic material used to completely surround and cover components of electromagnetic ballast, protecting them & dampening sound.
PULSE START LAMP - Specially designed metal halide lamp that uses a ballast with ignitor for starting.
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RATED LIFE - Number of operating hrs. at which 50% of standard lamps or 70% of pulse start lamps initially started will still be operating.
REACTOR BALLAST (LAG BALLAST) - Inductive component connected in series with an HID lamp to limit current; uses a coil of wire wound around an iron core connected in series with lamp.
RFI (RADIO FREQUENCY INTERFERENCE) - Form of electromagnetic interference.
SHROUD - Glass cylinder surrounding arc tube to protect against hot arc tube particles breaking the glass bulb if an arc tube rupture occurs; reduces risk of using metal halide lamps infixtures.
STARTING CURRENT (LINE) - RMS current measured through input terminals of ballast 5-15 seconds after lamp is started.
SYSTEM WATTS - Power measured on input terminals of ballast which is operating a reference lamp.
THREE PHASE CURRENT - Current delivered through three wires with each wire serving as return for the other two.
UL (UNDERWRITERS' LABORATORIES, INC.) - Laboratory that sets safety standards for building materials, electrical appliances and other products.
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WARM-UP TIME - Amount of time from ignition of lamp to 90% light output.
WATTS - Measure of energy used or emitted by lamp each second.
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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