CLD Lighting Design Codes, Standards & Regulations 4 — Questions and Answers
Question 1: A designer is working on a hospital patient room. Which IES document provides the most specific recommended illuminance levels for this application?
- IES RP-29 (Lighting for Hospitals and Healthcare Facilities) (Correct answer)
- IES RP-1 (Office Lighting)
- IES RP-8 (Roadway Lighting)
- IES RP-6 (Sports and Recreational Area Lighting)
Correct answer: IES RP-29 (Lighting for Hospitals and Healthcare Facilities)
IES RP-29 is dedicated to healthcare facility lighting and specifies illuminance targets for patient rooms, exam rooms, corridors, and surgical suites.
Question 2: Under ASHRAE 90.1 Space-by-Space method, a lighting designer must stay within the LPD allowance for each individual space. What is the alternative compliance path offered?
- Building Area Method (whole-building LPD) (Correct answer)
- Daylight Compliance Method
- Enhanced Controls Credit Method
- ENERGY STAR Equipment Method
Correct answer: Building Area Method (whole-building LPD)
ASHRAE 90.1 offers the Building Area Method as an alternative, assigning a single LPD value based on the building's primary use type.
Question 3: Which code requirement governs the minimum height of exit signs above the floor in most US jurisdictions?
- NFPA 101 Life Safety Code (Correct answer)
- NEC Article 411
- ASHRAE 90.1
- IBC Section 1205
Correct answer: NFPA 101 Life Safety Code
NFPA 101 specifies exit sign placement, visibility requirements, and mounting heights to ensure occupant safety during egress.
Question 4: A project pursuing LEED v4.1 BD+C certification wants points for the 'Interior Lighting' credit. Which prerequisite must first be met?
- Minimum Energy Performance prerequisite (compliance with ASHRAE 90.1) (Correct answer)
- Daylight credit threshold
- Light Pollution Reduction prerequisite
- Enhanced Refrigerant Management prerequisite
Correct answer: Minimum Energy Performance prerequisite (compliance with ASHRAE 90.1)
LEED requires the Minimum Energy Performance prerequisite—typically ASHRAE 90.1 compliance—before any lighting optimization credits can be pursued.
Question 5: The IES LM-79 standard defines the approved method for measuring which property of solid-state lighting (SSL) products?
- Photometric and electrical characteristics of complete SSL luminaires (Correct answer)
- Long-term lumen depreciation of LED packages
- Thermal resistance of LED modules
- Color shift over operating lifetime
Correct answer: Photometric and electrical characteristics of complete SSL luminaires
IES LM-79 establishes the electrical and photometric measurement procedures for complete SSL luminaires, including total flux, efficacy, and distribution.
Question 6: In a jurisdiction following the 2021 IECC, which type of space is exempt from the automatic shutoff control requirement?
- 24-hour continuously occupied spaces such as hospital critical care units (Correct answer)
- Open office areas larger than 500 ft²
- Retail sales floors
- Conference rooms
Correct answer: 24-hour continuously occupied spaces such as hospital critical care units
Spaces that must be continuously occupied for safety or operational reasons, like hospital critical care areas, are exempt from automatic shutoff controls.
Question 7: The FTC Lighting Facts label on lamp packaging is required to display which set of performance data?
- Brightness (lumens), energy used (watts), life (hours), light appearance (CCT), and energy cost estimate (Correct answer)
- CRI, beam angle, lumen maintenance, and color consistency
- Luminous efficacy, power factor, THD, and dimming range
- ENERGY STAR certification, UL listing, and RoHS compliance
Correct answer: Brightness (lumens), energy used (watts), life (hours), light appearance (CCT), and energy cost estimate
The FTC Lighting Facts label must show lumens, watts, estimated annual energy cost, lamp life, and light appearance (color temperature).
CLD Lighting Design Codes, Standards & Regulations 4
A designer is working on a hospital patient room.
Which IES document provides the most specific recommended illuminance levels for this application?