CLC Lighting System Commissioning & Quality Assurance 2

Question 1

What is the correct method for measuring illuminance during commissioning according to IES standards?

Accepted Answer

Take measurements on a defined grid pattern at the specified work plane height

Answer

IES standards require measurements taken on a grid pattern at the work plane height to accurately calculate average illuminance across the entire space.

Question 2

What does functional testing of a daylight harvesting control system primarily verify?

Accepted Answer

That the photosensor correctly adjusts electric light levels as daylight levels change

Answer

Functional testing confirms the photosensor correctly dims or switches off electric lighting in response to changing daylight, maintaining the target illuminance level.

Question 3

What is the purpose of 'burn-in' testing for new LED luminaire installations?

Accepted Answer

To allow initial operating hours that reveal early component failures before owner acceptance

Answer

Burn-in testing operates luminaires for an initial period to identify early-life (infant mortality) failures before the system is accepted by the owner.

Question 4

During LED dimmer commissioning, which performance parameter is most critical to verify?

Accepted Answer

Smooth dimming without flicker, strobing, drop-out, or audible noise across the full range

Answer

LED dimmers must be verified for smooth operation across the full dimming range, since incompatible dimmer-driver combinations commonly cause flicker, noise, or drop-out.

Question 5

What is the primary purpose of a lighting control narrative document?

Accepted Answer

To describe in plain language how the lighting control system should operate in each scenario

Answer

A control narrative provides a plain-language description of how the system responds in each mode or scenario, which guides commissioning verification and owner training.

(CLC) Certified Lighting Consultant Practice Test

(CLC) Certified Lighting Consultant Practice Test

CLC Lighting System Commissioning & Quality Assurance 2