Installation of Lighting Equipment Flashcards
What is the wavelength range of visible light?
What is the colour associated with the longest wavelength of this range?
400-700 nanometers
Red
What is a correlated colour temperature?
What are two common values & associated “colours”?
Value to give an idea of the colour of light produced.
- 5100K cool white (bluish)
- 2700K warm white (yellow/orange)
What is candela?
Measure of the brightness of a light source. Approximately the amount of light from one candle.
Don’t use this card. There is another card for Lumens.
What is a lumen?
Don’t use this card.
The quantity of light. Candela/second
What is lux?
Amount of illumination on an area. Lumens/meter2
What is efficacy?
How “efficient” a light is. Lumens/watt
What are three electric lighting sources?
- Incandescent
- Electric discharge lighting
- Light emitting diode
How do fluorescent lamps work?
Electric current is passed through a mercury vapour which produces an ultraviolet light, causing the phosphor coated tube to glow.
Approximately what percentage of energy in an incandescent lamp is produced as heat?
88%
What is a halogen lamp’s bulb made of?
Quartz
Do compact fluorescent lamps require a separate ballast?
Only if “non-integrated”
What is the filament material in a standard incandescent lamp?
Tungsten
What is the major downside to using LED lamps?
Price.
What is the difference between a lamp and a luminaire?
A lamp is the bulb or source of light and a luminaire is a lighting fixture.
What is the purpose of a ballast?
To create an arc to start a lamp and to limit current flow through a lamp.
What is the maximum current allowed for a lighting circuit in a single dwelling?
15 amperes.
What is a colour rendering index? (CRI)
A value which gives an indication of how well a light source reproduces the actual colours of an object.
100 is ideal.
In emergency lighting systems, the voltage drop shall not exceed 3% of the marked unit equipment. T or F?
False, it cannot exceed 5%
Emergency lighting equipment cannot be solely battery powered if the marked input rating exceeds _____ amperage or _____ voltage.
24 Amps
250 Volts
If it exceeds these values the unit equipment must be permanently connected
In dwelling unit branch circuits, what is the maximum volts-to-ground?
150
Which wavelength cannot be seen, but can be felt as heat?
A) Infrared
B) Ultraviolet
C) Fluorescent green
D) Bright blue
Infrared
In what two locations can emergency lighting circuits be ran with other wiring/equipment?
In transfer switches and emergency lighting supplied by two sources
What two types of ballasts are used for fluorescent lamps?
Magnetic and Electronic
Which visible colour has the shortest wavelength?
Violet (400nm)
On the Kelvin scale, room temperature would be about how many °K?
300°K
Daylight at noon has a correlated colour temperature (CCT) of approximately ______°K
5500°K
How is efficacy measured?
In Lumens per Watt.
Incandescents have an Efficacy of approximately 18 lm/W
If a light source that requires 50W produces 10,000 lumens, what is the efficacy of the source?
200 lm/W
What is the melting point of Tungsten?
3410 °C
Why is Tungsten used as a filament material?
Tungsten has a high melting point (3410 °C) and a slow rate of evaporation
What is the inert gas in some low wattage incandescent lamps?
Argon/Nitrogen mix
or a more expensive
Krypton/Nitrogen mix
What does the T in a T8 or T12 florescent lamp stand for?
Tubular
What coats inside of the glass in a fluorescent lamp?
Phosphors
True or False?
Halogen lamps output a whiter and less Orange light than incandescents.
True.
What are the basic types of fluorescent lamps?
Linear and compact
What are the advantages of an electronic ballast over a magnetic one?
Smaller
Lighter
More efficient
Less flicker
Produce less heat
Improve power factor
Reduce harmonic distortion
Why are electronic ballasts more efficient and have less flickering than magnetic ballasts?
Electronic ballasts increase the operating frequency of the lamp to 20kHz or more; magnetic ballasts output frequency is 60 Hz
Magnetic ballasts have a sound rating designated by which letters?
Letters A to F
A producing the least hum. (Homes, offfices)
F producing the greatest hum.
(Streetlights, Factories)
A unit of luminous intensity is called a ______?
Candela
A unit of measurement of the quantity of light emitted by a light source is called?
A Lumen
The unit of measure for colour temperature is known as?
The Kelvin
