CLD Energy Codes 3

Question 1

Under ASHRAE 90.1, exterior lighting power is regulated using which primary zone classification system?

Accepted Answer

Lighting zones LZ0–LZ4 based on ambient brightness

Answer

ASHRAE 90.1 assigns exterior lighting power allowances based on LZ0–LZ4 lighting zones that correspond to ambient light levels from undeveloped to high-activity urban areas.

Question 2

Which control strategy satisfies ASHRAE 90.1's requirement to reduce exterior building facade and landscape lighting during late-night hours?

Accepted Answer

Astronomical time switch programmed to reduce output after midnight

Answer

ASHRAE 90.1 requires exterior ornamental and facade lighting to be reduced by at least 30% after a specified time using an astronomical time switch or similar scheduling control.

Question 3

What is the purpose of the 'additional lighting power allowance' for ornamental chandeliers in ASHRAE 90.1?

Accepted Answer

To provide extra wattage for decorative luminaires not serving a task function

Answer

ASHRAE 90.1 grants a supplemental power allowance for decorative luminaires (chandeliers, sconces) that serve an ornamental rather than task or ambient function.

Question 4

A gymnasium with a high ceiling uses daylight from skylights. Under ASHRAE 90.1, what daylit zone boundary rule applies to a skylight?

Accepted Answer

The daylit zone equals 0.7 times the ceiling height, measured from the skylight edge

Answer

ASHRAE 90.1 defines the primary sidelit daylit zone from skylights as extending 0.7 times the ceiling height outward from the skylight edges.

Question 5

Which ASHRAE 90.1 section specifically covers interior lighting power for nonresidential facilities?

Accepted Answer

Section 9 — Lighting

Answer

ASHRAE 90.1 Section 9 contains all interior and exterior lighting requirements, including LPDs, controls, and exemptions.

(CLD) Certified Lighting Designer Practice Test

(CLD) Certified Lighting Designer Practice Test

CLD Energy Codes 3