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CLC Photometry & Color Science Flashcards

6 cards from real CLC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 CLC Photometry & Color Science flashcards as text

  1. Which photometric quantity describes the total luminous flux emitted by a light source in all directions, measured in lumens?

    Answer: Luminous flux

    Luminous flux (measured in lumens) represents the total quantity of visible light emitted by a source in all directions.

  2. The Color Rendering Index (CRI) measures a light source's ability to reveal colors compared to which reference source?

    Answer: A natural or reference illuminant

    CRI compares how accurately a light source renders object colors relative to a reference illuminant (daylight or incandescent, depending on CCT).

  3. A luminaire with an IES Type II photometric distribution is most appropriate for which application?

    Answer: Roadway / streetlighting on a two-lane road

    IES Type II distribution provides a medium-spread pattern suited for roadway and streetlighting on two-lane roads.

  4. Correlated Color Temperature (CCT) is measured in which unit?

    Answer: Kelvin

    CCT is expressed in Kelvin (K) and describes the color appearance of a light source from warm (2700K) to cool (6500K+).

  5. Luminance is defined as luminous intensity per unit of what?

    Answer: Projected area of the source

    Luminance (cd/m²) equals luminous intensity divided by the projected area of the emitting surface, describing perceived brightness.

  6. Which IES standard publication is the primary reference for photometric testing and measurement of luminaires in the US?

    Answer: IES LM-79

    IES LM-79 defines the approved method for total luminous flux, efficacy, and chromaticity measurements of SSL luminaires.