Daylight Introduction

The WWR ratio that is not suited for a building located in a hot arid climate

• 1:4

• 1:2

• 1:6

• 1:1

The absolute minimum value when calculating day light distribution necessary for performing an intended activity in a room to be taken as a thumb rule is

• 20% of the floor area X Daylight factor (DF)

• 80% of the floor area X Daylight factor (DF)

• 80% exceeded value of Daylight factor (DF)

• 20% exceeded value of Daylight factor (DF)

The most reliable USABLE DAYLIGHT COMPONENT for tropical and sub-tropical climates

• Direct Sunlight

• Reflected Light

• Light from diffuse sky

• Diffusely reflected light

In all Lighting scenarios r+a+t is

• Less than 1

• equal to 1

• exceeding 1

• zero

Density of light falling on a surface is

• Luminous Intensity

• Luminous Flux

• Illuminance

• Luminous efficacy

Luminous efficacy is expressed in

• Lumens/m2

• Lumens/W

• candela/m2

• candela/W

If the Luminous efficacy of a luminaire is in the range of 50-70 the type of luminaire can be

• LED

• Fluorescent lamp

• CFL

• Halogen lamp

The formula for Daylight factor is

• DF = (Ei / Eo) x 100%

• DF = (Eo / Ei) x 100%

• DF = (Eo / 100) x Ei%

• DF = (Ei / 100) x Eo%

The day lighting performance of a building is influenced primarily by

• The internal room reflectance and materials used (Ei)

• WWR ratio

• areas and geometry of the building

• ground reflectance (Eo)

If 40% of the sky is obstructed by dense vegetative cover at site level which has a reflectance factor of 30%, the externally reflected light that can be procured is

• 0.12XSC

• 1.2XSC

• 12XSC

• 0.7XSC