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24 Cards in this Set

  • Front
  • Back

6 BASIC METRICS

luminance, illuminance, intensity, luminous flux, efficacy, luminous exitance

luminance

intensity of a source or surface in the direction of an observer per projected area (cd/ft2)


(directionally dependent)

Luminous Flux

flow of light from some source in all directions (lm)



efficacy

measure of a sources ability to convert electrical power into lighting power

illuminance

amount of light present/density of luminous flux incident on a given surface, incident light (cant be seen)

luminous exitance

measures how much light/flux is leaving some surface


dependent on transmission/reflectance properties

2 types of reflectance

specular & diffuse

2500-3500 k

orange/yellow



3500-6000

white (warm)



6000- above

green blue purple (cool)




CRI

how accurately a source renders color, reference source for warm (incandescent), cool (daylight)

incandescent/filament

CCT=2600-3500k


CRI= 100


Life=1000-3000 hr


Cost= very low


Efficacy= 8-22 lpw

flourescent

A. Tubular


B. CFL (compact)


CCT= 2700-6000k


CRI= 70-90


Control- poor at given direction b/c phosphur coating


Tubular Life- 20,000 hr


CFL- 10,000 hr


Cost- Higher than incandescent


Efficacy- 50-80 LPW

Metal Halide

CCT= 2700-5600k


CRI= 60-90


Control- strong directional control


life= 10,000-20,000


Cost- high initial cost


Efficacy- 80-120 lpw



High Pressure Sodium

CCT- 1800-2200


CRI- 10's-20's


Life- 24,000 and up (long)


Efficacy- 45-150 lpw



LED

CCT- complicated


Control- color uniformity, dimmable


CRI- doesnt work


Life- 50,0000 hr


Cost- expensive


Efficacy-120 lpw

Indirect

90-100% of luminous flux above 90 degrees

Semi-Indirect

80-90% of luminous flux above 90 degrees

Direct/Indirect

40-60% of luminous flux above 90 degrees


60-40% of luminous flux below 90 degrees

Semi-Direct

80-90% of luminous flux below 90 degrees

Direct

90-100% of luminous flux below 90 degrees

3 types of occupancy sensors

*most common*

1. Passive Infared (PIR)


2. Ultrasonic Technology


3. Microphonic Technology


* dual technology best route (infared and ultrasonic)







Vacancy Control

Uses same sensors but must use a switch to turn the light on (energy code required)



photosensor (photocell)

helps to adjust lighting output based on natural light present in space