CEM Lighting Systems 4

Question 1

ASHRAE Standard 90.1 addresses lighting in the context of:

Accepted Answer

Energy efficiency of buildings including lighting power density limits

Answer

ASHRAE 90.1 sets energy efficiency requirements for commercial buildings, including maximum LPD limits by space and building type.

Question 2

Lamp lumen depreciation (LLD) refers to:

Accepted Answer

The gradual decrease in lumen output as a lamp ages

Answer

LLD is the ratio of lumens at a specific point in lamp life to initial lumens, reflecting gradual output decline.

Question 3

Which lighting technology offers the highest luminous efficacy (lumens per watt) among current commercially available sources?

Accepted Answer

LED

Answer

Modern LED sources can achieve 150–200+ lm/W, surpassing all other commercially available lighting technologies.

Question 4

A retail store wants to highlight merchandise with tight beam spreads. Which luminaire characteristic best describes beam control?

Accepted Answer

Beam angle or field angle

Answer

Beam angle (where intensity drops to 50% of peak) and field angle (10% of peak) define how tightly or broadly a luminaire concentrates light.

Question 5

In lighting controls, a closed-loop daylight harvesting system differs from an open-loop system because it:

Accepted Answer

Measures actual workplane illuminance and adjusts electric light to meet a setpoint

Answer

A closed-loop system uses a photosensor measuring workplane illuminance to maintain a target level by adjusting electric light output.

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