CLC Lighting Controls & Technologies 3

Question 1

Which ASHRAE/IES Standard 90.1 requirement mandates automatic shutoff controls for lighting in most commercial buildings?

Accepted Answer

Section 9 (Lighting)

Answer

ASHRAE 90.1 Section 9 covers lighting energy efficiency requirements, including mandatory automatic shutoff controls in commercial spaces.

Question 2

What does the term 'lumen maintenance' refer to in the context of LED driver dimming?

Accepted Answer

The ability of a driver to sustain consistent light output as the LED ages

Answer

Lumen maintenance describes how well a driver or system preserves rated light output over the operational life of the LED source.

Question 3

In a BACnet/IP integration with a lighting control system, what role does the BACnet object type 'Analog Output' typically serve?

Accepted Answer

Sending a variable setpoint such as a dimming level to a field device

Answer

BACnet Analog Output objects write continuous variable values—like a 0–100% dim command—to controlled devices in the field.

Question 4

Which color rendering metric better captures the ability of a light source to render saturated colors compared to CRI Ra?

Accepted Answer

IES TM-30 Rf and Rg

Answer

IES TM-30 uses 99 reference samples and reports both fidelity (Rf) and gamut (Rg), providing a more complete color rendering picture than the 8-sample CRI Ra.

Question 5

A retail store uses tunable white LED fixtures to shift CCT throughout the day. Which human-centric lighting benefit does this PRIMARILY target?

Accepted Answer

Circadian rhythm alignment and alertness regulation

Answer

Tunable white systems shift between warm and cool CCT to mirror the natural daylight cycle, supporting circadian health and alertness in occupants.

(CLC) Certified Lighting Consultant Practice Test

(CLC) Certified Lighting Consultant Practice Test

CLC Lighting Controls & Technologies 3