Lighting, Emergency Systems And Unit Equipment Flashcards
What range of electromagnetic wavelengths makes up visible light?
400 to 700 nanometers (nm)
How is the colour of light related to temperature?
The hotter the temperature of a blackbody is, the shorter the wavelength of light it gives off.
Red is the (highest/lowest) temperature with the (longest/shortest) wavelength.
Lowest ; Longest
Violet is the (highest/lowest) temperature with the (longest/shortest) wavelength.
Highest ; Shortest
What unit describes the brightness of a light source?
Candela
What does a lumen measure?
Quantity of light a source produces
If 200 lumens fall on an area of 5 metres square, what is the illumination of this area in lux?
40 lx
200 lm / 5m^2 = 40 lx
If a light source that requires 250W produces 21500 lumens, what is the efficacy of the source?
86 lm/w
21500 lm / 250W = 86 lm/W
What material is used to make the filament of an incandescent lamp?
a) gold
b) titanium
c) iron
d) tungsten
d) tungsten
What material is used to make the enclosure for the filament of a halogen lamp?
a) glass
b) acrylic
c) quartz
d) halogen
c) quartz
What is the composition of the coating in the tube of a fluorescent lamp?
a) phosphor
b) fluoresce
c) xanthium
d) halogen
a) phosphor
What are the two basic types of fluorescent lamps?
Linear and Compact
What is different about the frequency of electronic ballasts compared to magnetic ones?
Electronic ballasts have a higher frequency than the standard 60 Hz of a magnetic ballast
Which type of lamp is a metal-halide?
HID
What does LED stand for in the lighting industry?
Light emitting diode
How many 8ths of an inch is the diameter of a F28 T5/841 lamp?
5/8
Which type of lamp would you expect this to be?
MH1500/BU
Metal Halide
Which type of lamp would you expect this to be?
H37 KB-250
Mercury vapor
Which ANSI ballast is indicated by the following label?
C70S62/D/M
S62
Which ANSI ballast is indicated by the following label?
H44GS100
H44
What does halogen do in an incandescent lamp?
It helps redeposit the tungsten back onto the filament for longer life
What does the blackening on one end of a rapid start lamp indicate even if the lamp has only been on a short length of time?
It indicates a poor or loose connection and that the electrode is not receiving heating current
What does the cycling of a LPS lamp indicate?
The lamp should be replaced
What, besides a burnt out lamp, does a lamps failure to start indicate?
A bad ballast
What are the two (2) main ways of restricting lamp changeability?
- Lamp base or pin type
- Warning labels
What is the effect of replacing a lamp with another lamp that has the same electrical requirements, but different CCT?
Colour enhancement would change, so retail products may not appear as they should
What is the maximum allowable branch circuit voltage-to-ground for a circuit in a dwelling unit?
150V
What are the two (2) switching restrictions for luminaries located near combustible material?
- luminaries of the un-switched type
- luminaries controlled by a wall switch
What precautions must be observed when installing a rigid luminaire within 2.1 m of the floor?
It must be protected from mechanical injury by guard or by location
In a dwelling unit, a main floor stairway with four risers must have a luminaire controlled by 3-way switches located at the head and foot of the stairway.
True or False
True
What is the maximum allowable weight of a ceiling luminaire that is supported directly by an outlet box mounted on a bar hanger?
23 kg
30-302
What is the minimum distance a recessed NON-IC luminaire enclosure must be away from a combustible material?
13 mm
Which conductor must be attached to the screw shell of a lampholder?
The identified conductor
