Exam (elaborations)
ALA LIGHTING ASSOCIATE LESSON 2 TEST
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ALA LIGHTING ASSOCIATE LESSON 2 TEST....
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Four primary light sources. - ANSWER: Incandescent/halogen,fluorescent/compact fluorescent, and LED (light emitting diodes).
- HID (high-intensity discharge)
CFL (Compact Fluorescent) is at least four times more efficient than
incandescent and halogen lighting.
LEDs are likely to become the primary light source for home fixtures within the
next five years.
Lumen - A measure of light production.
Watts - A measure of energy used.
Efficacy - ANSWER lumens/watt evaluates the efficiency of a light source.
Efficacy of Incandescent - Answer: 10-20 lpw
Fluorescent Efficacy: 60-100+ lpw
Efficacy of HID: 50-120+ lpw
LED Efficacy: 40-100+ lpw.
High Efficacy - Answer: 50+ lpw
Candle Power - ANSWER discusses light dispersion from directional sources.
footcandle is a measure of light falling on a surface.
The recommended number of foot candles for visual tasks is 30-50.
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