7 Flashcards
CRI describes the quality of light on a
0-100 scale
Light emitted from a metal object heated to the point of incandescent and describes
halogen lamp operation
usually means that a light source will render colors poorly
low CRI #
Wall washer luminaires are best described as having an ___ form of light distribution.
asymmetric
Light emitted from a metal object heated to the point of incandescent and describes
halogen lamp operation
Efficacy is energy efficiency of a light source is measured in
lumen per watt l/w
can’t tell you how well a light source will render colors.
color temp
refers to windows and skylights used to bring daylight into the interiors of building
Fenestration
The energy saving benefits of daylight are realized when electric lights are
switched off or dimmed.
s an approach whereby only 1 luminaire is designed to provide all task and ambient lighting.
General lighting
provides a framework for understanding and achieving composition and aesthetic in lighting design.
Layering
can auto set time according to the time of the year auto adjust for sunrise and sunset as it changes throughout the year.
astronomical time switch
illuminating the ceiling often with the intent to provide indirect lighting by bouncing light back toward the space.
uplighting
describes how warm or cool light appears.
color temp
2 major principles are controlling ____ and ___ in controlling lighting systems
power
time
The best method for low voltage remotely controlled amount of operating time for lighting systems is a
relay system
foot candle is the measure of the light that falls on a surface and is expressed in
lumen per sq. ft.
Methods used to integrate daylight with electric lighting controls is to
1 provide adequate manual switching or dimming.
- Use automatic photoelectric device in each daylight zone to switch lights off during daylight.
- Use auto photoelectric system to switch lights off during daylight hours or dim light in proportion use auto time of day control system with astronomical time functions
3 common sense approaches to design lighting control.
a. where switches and dimmers located
b. how many location for switching
c. determining what type of switching or dimming is necessary.
2 reasons for daylighting are
- daylighting
2
2 advantages of preset dimmers are
- allow 3 and 4 way switching
2. permit setting a preferred light level to leave it there even when lights are switched.
4 main considerations to apply lighting tech
- impact of energy policies,
- service life,
- color characteristic,
- matching lamps to application.
2 broad ballast categories
electronic
magnetic
3 types if fluorescents ballast
- instant
- rapid start
- programmed rapid start
