Lighting Lvl 2 Flashcards
(33 cards)
What lamps use regenerative cycle
Tungsten halogen lamp
Three main types of devices used to control incandescent lamps
Snap switch (standard toggle)
Dimmer switch
Relay and contactors
How efficient are incandescent lights and how much heat loss
5-10% efficient
90-95 % heat loss
Three types of glass bulbs
Clear = spotlights/projectors
Diffuse=reduces brightness increase surface
Colour = coloured glass (Xmas lights)
Efficacy meaning
Lumen output /per watt
How well light uses electrical energy to produce light energy
Over voltage and under voltage impact on light?
Over voltage = brighter/ reduced life
Under voltage = less light\ increased life
What wattage are filament lamps filled with inert gas to prevent evaporation?
40w and above
What are rough service lamps
Used with extension cords for use where physical abuse is likely )job site extension lights)
Tungsten halogen lamp is a type of what?
Incandescent lamp - uses quartz glass to sustain higher temperature. Used in floodlights. Quartz melting point 1650c
Tungsten halogen lamps usual wattage
300/500/1000w
Produce WHITE light
Low voltage relay contactors usual voltage
24v / 30v
Led disadvantages
Heat sensitive
More expensive
Cast light at a narrow angle
Lamp with longest lifespan?
Induction lamp
Most efficient lamp source presently available
Low pressure sodium 200Lm/W
What HID has no starting electrode?
High pressure sodium
Blackening of the ends of fluorescent lamp means what
Defective starter/ballast
Slim line lamp base
Single pin
Advantages of induction lighting
-long life
-high reliability
- low temperature
Factors that contribute to quality of light
Glare
Colour
Diffusion
Which HID lamp cycles on and off at the end of its life
High pressure sodium
Capacitor in mercury Vapor lamp is used to_____
Correct the power factor
Which HID cycles on and off at the end of its life
HPS
The unit for luminous flux ( quantity ) is____
Lm (lumen)
Which fluorescent ballast needs bimetallic thermal starter
Pre heat
