Module 4, Lesson 3 Flashcards
Fluorescent light characteristics
Most common light source outside of the house, coated in phosphor and a small amount of mercury, and contains cathodes
How a fluorescent illuminates
Voltage is applied to the cathodes, electrical arc jumps thje length of the tube, this energizes the phosphorus by ultraviolet light, and produces light
How many lumens of light per watt of electricity are consumed
65-75
4 types of common fluorescent bases
Bi-pin, single pin, recessed double contact, and compact fluorescent series
Shapes of fluorescents
Ring or circular, u-shaped, double-folded, and compact
Fluorescent currents are measured in
Milliamps
3 main operating currents
Pre-heat, instant-heat, and rapid-heat
Fluorescents and incandescents have what in common
Coding systems
Coding systems designate what
Color illumination
Fluorescent ballast characteristics
Regulates current, generates starting and operating voltage, considered part of the fixture, provides the voltage “kick” to start the lamp called “striking the arc” “, and all have ballast rating codes
CBM stands for
Certified Ballast Manufacturer
Many compacts have this installed
Ballast
Electronic fluorescent ballast characteristics
Good for electrical distributors, new laws of energy requirements, all has to do with energy consumption and better products, little or no noise, lighter, and longer life
Fluorescent luminarie characteristics
Sold with ballast, housing, and cover, see a lot in commercial apps
Troffer
Fixture that mounts recessed in the ceiling
4 categories for recessed fluorescent fixtures
Static, air supply, heat extraction, and combo
Fluorescent troffer fixture types
Grid-type, type F, surface mounted, base-bones, open reflector, and wrap-around
Grid-type
Lay in for suspended ceiling
Type F
Mounted in sheetrock with flanges and wire hinges
Surface mounted
Most common
Bare-bones
Just has a housing, ballast, and lamp
Wrap-around
Actually hung from the ceiling
Open reflector
Used in industrial settings where utility is primary consideration
What do reflectors provide
A degree in “up-light” or the light reflected from the ceiling
What can reflectors be made of
Baked enamel, aluminum, procelian, and plastics
2 electronic ballast operating modes
Instant-heat and rapid-heat
Ballast power factor
Measurement of how effectively the input current is converted into usable power
Define diffusers
Glass or plastic lamp covers in a number of different styles
Lenses
Glass of plastic covers that focus on the direct light from of the lamp
2 types of plastic lenses
Extruded or injection-molded
The most common type of lens
The prismatic type
Define louvers
The most sophisticated type of lamp cover
