What is the main purpose of lighting?

• To eliminate shadows

• To reduce energy consumption

• Only to improve aesthetics

• To ensure that objects and surroundings are seen clearly

Which of the following is NOT a reason to use lighting?

• Reduce electricity costs

• Fear of darkness

• Extend the use of spaces

• Improve visual performance

The visible light spectrum ranges between:

• 600 nm - 1200 nm

• 380 nm - 760 nm

• 200 nm - 800 nm

• 100 nm - 500 nm

What is the function of cones in the human eye?

• Provide color vision and sharp details

• Detect infrared light

• Detect low light conditions

• Absorb ultraviolet radiation

What is the approximate number of rod cells in a human eye?

• 5 million

• 1 million

• 125 million

• 50 million

What is the wavelength of maximum sensitivity of the human eye in photopic vision?

• 555 nm

• 620 nm

• 480 nm

• 400 nm

What color temperature is associated with an incandescent lamp?

• 5500 - 6000 K

• 4000 - 5000 K

• 7000 - 8000 K

• 2500 - 3000 K

What does the color rendering index (Ra) measure?

• The energy efficiency of a lamp

• The brightness of the light

• The temperature of a light source

• The ability of a light source to render colors accurately

Which property of lighting explains the wave-particle duality of light?

• The Maxwell equations

• The Huygens wave theory

• Quantum mechanics

• Newton's particle theory

What is the SI unit for luminous flux?

• Watt

• Lux

• Candela

• Lumen