Practice Test Geeks(CLC) Certified Lighting Consultant Practice Test
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Lighting Calculations & Software Flashcards

7 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 7 Lighting Calculations & Software flashcards as text

  1. In AGi32 or DIALux, what does the 'calculation grid' spacing setting control?

    Answer: The density of illuminance sample points across a surface

    Calculation grid spacing determines how many sample points are evaluated per unit area, affecting result accuracy and computation time.

  2. A maintained illuminance value in a lighting design accounts for which factor?

    Answer: Light loss factors applied to initial illuminance over time

    Maintained illuminance equals initial illuminance multiplied by the light loss factor, representing real-world conditions after aging and dirt accumulation.

  3. Which IES photometric file format is the current standard used by most US manufacturers?

    Answer: IES LM-63

    IES LM-63 is the IESNA standard format for electronic transfer of photometric data and is widely used by US luminaire manufacturers.

  4. In a zonal cavity calculation, the cavity ratio (CR) formula uses which room dimensions?

    Answer: Height, length, and width of the cavity

    The cavity ratio formula is CR = 5h(l+w)/(l×w), using the cavity height, length, and width.

  5. What is the purpose of the 'Obstructed Sky Model' in daylighting simulation software?

    Answer: To model sky luminance blocked by surrounding buildings or terrain

    The Obstructed Sky Model accounts for nearby structures or terrain that block portions of the sky dome, reducing available daylight.

  6. A designer calculates an average illuminance of 55 fc on a task surface. The target is 50 fc. What is the coefficient of utilization most likely scenario?

    Answer: The design exceeds the target and may allow fixture reduction

    When calculated illuminance exceeds the target, the designer may reduce fixture count or dimming to optimize energy use while meeting the standard.

  7. In photometric software, 'false color rendering' of an illuminance plot primarily helps designers to:

    Answer: Quickly identify areas of uniformity and hotspots visually

    False color maps use a color spectrum to visually represent illuminance levels, making it easy to spot bright spots, shadows, and uniformity issues at a glance.