CLC Cheat Sheet 2026

The 30 highest-yield CLC facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which document establishes the intended performance expectations of a lighting system before commissioning begins? → Owner's Project Requirements (OPR)
2. What is the relationship between daylighting integration and overall Certified Lighting Consultant professional competency? → It is an essential component that strengthens the overall competency framework
3. How does smart lighting improve user experience? → Offers automation and personalization
4. How should CLC professionals measure success in light source technology & leds? → Using defined metrics, benchmarks, and regular evaluation against established goals
5. Which term describes the ratio of maintained horizontal illuminance to minimum horizontal illuminance across a defined area? → Illuminance uniformity ratio
6. The R9 value within the extended CRI test is specifically used to evaluate a source's ability to render which color? → Saturated red
7. What is the role of color temperature in lighting design? → It affects the ambiance and perception of a space
8. When implementing daylighting integration practices, what should CLC professionals prioritize? → Alignment with professional standards, stakeholder needs, and organizational goals
9. How should CLC professionals measure success in daylighting integration? → Using defined metrics, benchmarks, and regular evaluation against established goals
10. Which certification indicates a lighting product is energy efficient? → ENERGY STAR®
11. What is a common pitfall when implementing emergency & exit lighting standards practices? → Failing to adapt approaches to specific contexts while maintaining core principles
12. What is the importance of energy codes in lighting? → They regulate energy use and efficiency
13. Luminance is defined as luminous intensity per unit of what? → Projected area of the source
14. How can lighting design contribute to sustainability? → By optimizing energy use and materials
15. How does lighting calculations & software contribute to professional excellence in CLC certification? → It enhances competency, improves outcomes, and supports continuous professional growth
16. During commissioning of occupancy sensors, which parameter is most critical to verify for energy performance? → The time delay before lights turn off after the space becomes unoccupied
17. What challenge is most commonly encountered in human centric lighting & wellness within Certified Lighting Consultant practice? → Resistance to change and difficulty maintaining consistency across stakeholders
18. What is daylight harvesting in lighting technology? → Adjusting lighting based on natural daylight
19. When implementing light source technology & leds practices, what should CLC professionals prioritize? → Alignment with professional standards, stakeholder needs, and organizational goals
20. What is a 'punch list' in the context of a lighting commissioning project? → A list of deficiencies, incomplete items, or corrections needed before project closeout
21. How should CLC professionals measure success in outdoor & landscape lighting? → Using defined metrics, benchmarks, and regular evaluation against established goals
22. What role does collaboration play in emergency & exit lighting standards for Certified Lighting Consultant professionals? → It brings diverse perspectives that strengthen decision-making and improve results
23. What is the primary goal of lighting design in architectural spaces? → To improve comfort, aesthetics, and functionality
24. What is the primary purpose of lighting commissioning? → To verify that a lighting system is installed and operates according to design intent
25. How does lighting control systems benefit energy management? → They reduce energy waste through automated control
26. In residential bedroom design, which lighting strategy is recommended to minimize blue-light exposure before sleep? → Dimming to low levels with warm (2700K or below) CCT in the evening
27. How do lighting safety standards protect occupants? → By minimizing electrical and fire hazards
28. How does project budgeting & specification contribute to professional excellence in CLC certification? → It enhances competency, improves outcomes, and supports continuous professional growth
29. At what stage of a project should commissioning activities ideally begin? → During schematic design, when project goals and requirements are being established
30. Which organization develops many widely adopted lighting standards? → IES