PAE400255 Datasheet, PDF (55/56 Pages) List of Unclassifed Manufacturers – Venture Lighting

Glossary cont.
Warranty
Arc Tube: A completely sealed quartz or
ceramic tube where the electrical discharge
(arc) occurs and generates light
Auxiliary Light: Back-up light source to the
HID light; typically a quartz halogen type
Ballast: A device that, by means of resistance,
inductance, capacitance or electronic elements,
singly or in combination, controls the current,
voltage and waveform to the required values
for proper lamp starting and operation for a
HID ballast operating at a given supply voltage
Ballast Characteristic Curve: The curve of
lamp wattage vs. lamp voltage over a range of
normal lamp voltages, when a HID ballast
operates at a given supply voltage
Ballast Factor: Typically associated with
fluorescent systems; metal halide ballasts are
designed to operate lamps at rated watts,
whereas some fluorescent systems are designed
to operate at a fraction of rated watts
Burning Position: The position in which
lamps are designed to operate
Cold Start Time: The amount of time from
the application of ballast voltage to ignition
of the arc discharge
Colour Rendering Index (Ra):
A measure of a light source’s ability to render
colours relative to a standard
Constant Wattage Autotransformer (CWA)
Control Gear: An autotransformer lead
ballast circuit incorporating 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 nar-
row range by controlling lamp current
Correlated Colour Temperature (CCT):
The perceived “colour” of the light emitted
by a lamp expressed in Kelvin (K units)
Current Crest Factor: The ratio of the peak to
the rms value of lamp current; metal halide
values range from 1.5 to 1.8
Economic Life: The number of hours
a group of lamps will burn before it is
economically and aesthetically advisable
to group relamp (typically 60% to 75%
of rated life)
Efficacy (Lamp): A ratio of lumens to watts;
often calculated with either lamp watts
or system watts; measured in lumens
per watt (LPW)
Formed Body Arc Tube: Precisely
reproducible ellipsoidal arc tube formed
by Venture’s quartz sculpting process; has
2/3 less quartz mass than standard arc
tubes for equivalent lumens; has no starter
electrode
HID: High Intensity Discharge lamps; includes
metal halide, mercury vapor and high
pressure sodium
Hot Restart or Restrike Time: The amount of
time from return of power after an interruption
to the point of lamp ignition
Ignitor: An electronic device which provides,
by itself or in combination with other circuit
components, the appropriate electrical
conditions to start a discharge lamp
Ignitor CWA Control Gear: CWA control gear
using an ignitor to start the lamp
Initial Lumens: The light output of a lamp,
based on photometry results, at rated
wattage after 100 hours of operation
Input Voltage at Lamp Dropout
(Extinction Voltage): The rms value of supply
voltage at which a reference lamp extinguishes
when the supply voltage is uniformly reduced
from rated value at 2% to 3% of rated voltage
per second
Input Watts: The power measured on the
input terminals of a ballast which is operat-
ing a reference lamp
Lag Ballast: A ballast exhibiting primarily
inductive electrical characteristics, including
a lagging lamp current with respect to line voltage
and lagging or corrected line power factor.
Lamp Voltage: The voltage at which lamps
operate when they are fully warmed up
Lamp Wattage: The power consumed by a
lamp after warm-up
Light Center Length (LCL): The distance
from the center of the arc discharge to
the end contact of the base
Lumens: A measurement of light output; takes
into account the human eye sensitivity curve
so that more weight is given to the
yellow-green part of the light spectrum
Lumen Maintenance: The lumen output
provided by a lamp at a given point in or
percentage of its life
Lumens Per Watt (LPW): A ratio of lumens to
watts; often calculated with either lamp watts
or system watts; measured in lumens per
watt (LPW)
Luminaire Requirements: The type of
luminaire a lamp requires; i.e., enclosed or
open rated
Maximum Overall Length (MOL):
The maximum allowable distance from
the top of the glass bulb to the end
contact of the base
Normal (Low) Power Factor Ballast: A ballast
of the multiple-supply type that does not have a
means for correcting the input power factor
Occupancy Sensor: Control device that dims or
turns lights off after the space becomes
unoccupied; may be ultrasonic or infrared-actuated
Open Circuit Current (Line): The RMS current
measured through the input terminals of a
ballast with lamp removed or inoperative
Open Circuit Voltage, Ballast (OCV): The
voltage across the output terminals of a ballast
when no load is connected (RMS, unless
otherwise stated)
Open Rated Lamp (E27): Designed for open
luminaires; has a narrower neck than standard
E27 base lamps. Lamp arc tube is surrounded
by a protective quartz shroud.
Open Rated Lamp (E40): Designed
for open luminaires. Lamp arc tube is
surrounded by a protective quartz shroud.
Operating Current (Line): The power
factor corrected current measured through the
input terminals of a ballast which is operating
a reference lamp
Operating Voltage: The voltage at which lamps
operate when they are fully warmed up
Peak Lead Ballast: A ballast that produces a
highly peaked open circuit voltage wave shape
and has a capacitor in series with the lamp
Position Oriented Mogul Base (POMB, EP39,
EP40): Used with horizontal burning lamps;
has an aligning pin embedded in the base for
proper lamp orientation when it is screwed
into its socket; should only be used in yellow
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