8 Flashcards
_____ is a method of describing the color of a lamp’s light output. It references the CIE standard chromaticity diagram and is expressed as “x” and “y” coordinates on the diagram
Chromaticity
An electronic ballast that provides precise heating of the lamp filaments and tightly controls the pre-heat duration before applying starting voltage to ignite the lamp is called a(n) ___ .
programmed start ballast
A fluorescent lamp that has single pin contacts and requires no filament heating to ignite is called a(n) ____ lamp.
SLIMLINE
_____ is the spiraling or swirling of fluorescent lamps at initial turn on or energy-saving lamps at low temperature or low-current.
Striation
A ______ is an electromagnetic ballast that starts and operates preheat lamps similar to a rapid start lamp.
Trigger start ballast
refers to the light output from a fluorescent lamp that diminishes as the lamp is used
lamp lumen depreciation
Raising ____ at which power is applied to fluorescent lamp allows both the lamp and ballast to operate more efficiently
frequency
is the measurement of how effectively a ballast converts the voltage and current supplied by power source into watt of visible power delivered to the ballast and lamp.
power factor
on power lines can cause overheating of neutral wires panelboard transformers and capacitors
Excessive harmonic distortion
the lamp and ballast system ability to minimize light output depreciation over life of the lamp.
Lumen maintenance
When switches or dimmers are positioned before the power supply of the lighting fixture and power supplying the power supply will continue to consume energy even when shut off
off state power consumption.
which type of Hid operated more like fluorescent
Low pressure sodium
when making a comparison of light output between an LED fixture and a conventional lighting fixture what photometric data should be used
fixture lumens
Mercury vapor and traditional metal halide include an internal within and arc tube.
probe
To calculate power factor ballast use _____
Input watts/Input VA
2 key measures of quality of white light are
color rendering mix
corrected color temp
LED cove lighting are well suited for
uplighting
effect lighting
LED fixture consist of
LED lamps Fixture housing
electronics
primary lensing
Diode is considered forward biased when
a neg. charge is applied to the n-type side of a diode
used in theaters, concerts , stage production, restaurants, casino and various other public spaces calling for dramatic lighting
Full color led lighting
The junction temp on a LED is affected by
ambient temp
Thermal path
drive currents.
NOT AFFECTED by dimmers or control wattage
T12 bulb will measure
12x(1/8) = 1.5 inches
6 protection scheme e-vision ballast are
internal fusing auto thermal protection reset power control monitoring auto lamp power control auto lamp monitoring output short circuit
3 factors light fixture deliver to lighting task
angle of fixtures (height)
Distance from area to be lit
amount of lamp life remaining
3 factors that affect junction temp of LEDs
Drive current
Thermal path
ambient temp
4 advantages of led over conventional fixtures
longer life
energy efficiency
better lumen maintenance
wide spectrum of colors
4 possibilities of using microprocessor electronic ballasts
daylight harvesting
load shedding
dimming
energy savings.
3 basic task a fluorescent ballast must do
provide starting voltage
regulate current
control lamp voltage
