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NCIDQ | LIGHTING QUESTIONS AND ANSWERS WITH SOLUTIONS 2024

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NCIDQ | LIGHTING QUESTIONS AND ANSWERS WITH SOLUTIONS 2024

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  • August 30, 2024
  • 35
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • NCIDQ
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NCIDQ | LIGHTING QUESTIONS AND
ANSWERS WITH SOLUTIONS 2024
Lamp - ANSWER The correct term for the manufactured unit that produces light is a LAMP.



Do not confuse it with FIXTURE.



common lamps - ANSWER Incandescent

Halogen

Fluorescent

CFL or Compact Fluorescent Lamp

Metal Halide

High Pressure Sodium

Specialty



CRI - ANSWER Color Rendering



A measure of lighting quality.



This measure is based on an index that ranges from 1-100 with natural daylight and halogen lighting
being 100 CRI



Objects (such as artwork,

jewelry, fabrics) illuminated with halogen lamps that have a high CRI, will appear more true to life.



Color of objects can be perceived more accurately under lamps with a high CRI. Another wonderful

side effect of high CRI light sources is that they produce a higher perceived level of light (they look

brighter) which in turn makes them more energy effective (you save money).



Color Rendering Of Common Lamps - ANSWER Incandescent 100%

,Halogen 100%

Fluorescent 60% up to 92%

Metal Halide 65% up to 92%

High Pressure Sodium 21% up to 85%



Color Temperature - ANSWER is a measure of the apparent color of the light source (color appearance).



It is expressed

in Kelvin; the lower the color temperature, the warmer the apparent color, and the higher the color
temperature, the cooler the apparent color.



(a 2800K source will be warmer than a 600K

source.)



Light Source + Color Temperature - ANSWER Clear blue sky 12,000

Overcast sky 7,000

Sunlight 5,000

Metal Halide 4,500

Solux 3,500 to 4,700

Halogen 3,000

House Lamp 2,500

Candle Flame 1,500



Consider and compare the following when making an informed choice of lamp

type: - ANSWER Cost

Life

Wattage

Output (candela, candle power, or lumens)

CRI

,Color temperature



Ambient lighting - ANSWER general, overall illumination that:



• Enables one to move about easily and safely

• Defines the space

• Makes the room seem larger

• Makes the space more comfortable by balancing the brightness of surfaces and objects in the field of
view.

General lighting that brightens objects and surfaces in the lower part of the room creates a feeling of
warmth and intimacy, whereas indirect lighting, directed to the upper walls and ceiling, gives the space a
cooler, quieter, more spacious look.



Task Lighting - ANSWER light to work by



Task lighting illuminates areas where work is performed



Paper work and reading generally require plentiful, well-diffused light coming from

over the shoulder or from the side. For kitchen and hobby tasks, a concentrated light from above usually

works best.



Efficacy - ANSWER is a measure of efficiency, expressed in lumens per watt.



This is most important for energy

conservation.



Incandescent - ANSWER tungsten filament placed in sealed bulb, containing inert gas.



various shapes, sizes, + wattages

low cost

, good color rendering

easily dimmed.



warmer color



low efficacy

short lamp life

high heat



mr-16 - ANSWER low-voltage mulitfaceted mirror reflector



narrow beam (spot) to medium-wide spread



spot lights, good for jewlery



incansecent



Light - ANSWER Visually evaluated radiant energy



Visible light - ANSWER Form of electromagnetic radiation with wavelengths that range from abbout
400nm for violet light to about 700 nm for red light. White light is produced when source emits equal
quantities of energy over entire visible spectrum



Candlepower (CP) - ANSWER Unit of luminous intensity approximately equal to the horizontal light
output from an ordinary wax candle



Candela (CD) - ANSWER SI (metric) equivalent to Candlepower - unit of luminous intensity approximately
equal to the horizontal light output from an ordinary wax candle

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