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24 Cards in this Set
- Front
- Back
6 BASIC METRICS |
luminance, illuminance, intensity, luminous flux, efficacy, luminous exitance |
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luminance |
intensity of a source or surface in the direction of an observer per projected area (cd/ft2) (directionally dependent) |
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Luminous Flux |
flow of light from some source in all directions (lm) |
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efficacy |
measure of a sources ability to convert electrical power into lighting power |
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illuminance |
amount of light present/density of luminous flux incident on a given surface, incident light (cant be seen) |
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luminous exitance |
measures how much light/flux is leaving some surface dependent on transmission/reflectance properties |
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2 types of reflectance |
specular & diffuse |
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2500-3500 k |
orange/yellow |
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3500-6000 |
white (warm) |
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6000- above |
green blue purple (cool)
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CRI |
how accurately a source renders color, reference source for warm (incandescent), cool (daylight) |
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incandescent/filament |
CCT=2600-3500k CRI= 100 Life=1000-3000 hr Cost= very low Efficacy= 8-22 lpw |
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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 |
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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 |
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High Pressure Sodium |
CCT- 1800-2200 CRI- 10's-20's Life- 24,000 and up (long) Efficacy- 45-150 lpw |
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LED |
CCT- complicated Control- color uniformity, dimmable CRI- doesnt work Life- 50,0000 hr Cost- expensive Efficacy-120 lpw |
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Indirect |
90-100% of luminous flux above 90 degrees |
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Semi-Indirect |
80-90% of luminous flux above 90 degrees |
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Direct/Indirect |
40-60% of luminous flux above 90 degrees 60-40% of luminous flux below 90 degrees |
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Semi-Direct |
80-90% of luminous flux below 90 degrees |
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Direct |
90-100% of luminous flux below 90 degrees |
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3 types of occupancy sensors |
*most common*
1. Passive Infared (PIR) 2. Ultrasonic Technology 3. Microphonic Technology * dual technology best route (infared and ultrasonic) |
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Vacancy Control |
Uses same sensors but must use a switch to turn the light on (energy code required) |
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photosensor (photocell) |
helps to adjust lighting output based on natural light present in space |