NCQLP LC study guide
NCQLP LC · Work through your exam, one topic at a time.
The Lighting Certified (LC) designation is awarded by the National Council on Qualifications for Lighting Professions (NCQLP), a non-profit organization founded in 1991 to serve and protect the well-being of the public through effective and efficient lighting practice. Through a peer-review process, the NCQLP establishes the education, experience and examination requirements for baseline certification across the lighting professions. The credential is aimed at professionals whose work touches lighting - designers, engineers, architects, specifiers, manufacturers' representatives, facility and energy managers, and others who need to demonstrate a baseline command of lighting practice rather than a single specialty. Because the NCQLP frames certification as baseline competence across the lighting professions, candidates should expect the examination to draw on the full breadth of lighting practice - photometry and calculations, lamps and controls, luminaire application, design criteria, codes and energy considerations, and documentation - rather than a narrow product or software focus. The organization also runs an Intern Program: qualified students, or graduates within one year following graduation with a bachelor's degree only, may take the examination as an Intern. Preparation starts with the current LC Candidate Handbook, which the NCQLP publishes with all application materials and detailed information about the examination. Topics on this exam: Lighting practice (content domains not enumerated in source). The NCQLP LC study guide has 1 section and about 426 words.
01Lighting Practice: Criteria, Calculations, Compliance, and Delivery
Lighting practice tests whether you can turn a client's needs into a documented, code-compliant, energy-conscious lighting installation. Expect to move between design criteria, calculation, standards, and project delivery - and to justify each decision with numbers rather than preference. Take task illuminance from the applicable IES recommendation for the space type, not from habit or from a previous project. Put uniformity (max:min and avg:min), veiling reflections, and glare metrics (VCP, DGP, UGR) into the criteria before choosing luminaires.
426 words, about 2 minMore study resources for NCQLP LC
- Practice questionsUnder the IES recommended practice for office lighting, what does a maintained illuminance of 500 lux on the task surface most directly reflect?
- FlashcardsIlluminance. Luminous flux incident on a unit area of surface, measured in lux (lm/m²) or footcandles (lm/ft²).
- Cheat sheetIlluminance E (lux) = luminous flux incident per unit area; E = Φ/A for uniform flux on a surface, and E = I/d² for a point source at perpendicular distance d (inverse-square law).
- Key termsLuminous flux. The total amount of visible light a lamp or luminaire emits in all directions, measured in lumens.
- Study planDefine and write out, in your own words, the core quantities of lighting practice (luminous flux, illuminance, luminance, luminous intensity, and their units) and convert between them in worked examples.
- Common mistakesMost candidates come from design practice where judgment and client preference drive decisions, so they default to 'what looks best' instead of the numeric target or recommended practice the item is testing.
- Exam-day guideBring the original, unexpired ID (driver's license or passport) with a signature and photo.