Candela/metre square is the unit of which photometric quantity? Illuminance Luminance Luminous Intensity Luminous flux TRUE ANSWER : ? YOUR ANSWER : ?
Which lamp has the best Colour Rendering Index (CRI)? High pressure sodium vapour Fluorescent LED Incandescent TRUE ANSWER : ? YOUR ANSWER : ?
Luminous efficiency of a fluorescence lamp is 30 lumens / watt. 40 lumens / watt. 60 lumens / watt. 70 lumens / watt. TRUE ANSWER : ? YOUR ANSWER : ?
What will be the total flux emitted by a source of 60 candle power? 60 lumens. None of these. 0.001326 lumens. 754.2 lumens. TRUE ANSWER : ? YOUR ANSWER : ?
In illumination technology total lumens emitted by source / total lumens available after waste of light is equal to absorption factor. utilization factor. beam factor. waste light factor. TRUE ANSWER : ? YOUR ANSWER : ?
___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions. Utilization. Depreciation. Absorption factor. Maintenance. TRUE ANSWER : ? YOUR ANSWER : ?
Luminous efficacy of a typical HPSV lamp is in between 70 - 120 lm/watt. 40 - 70 lm/watt. 10 - 40 lm/watt 120 - 200 lm/watt. TRUE ANSWER : ? YOUR ANSWER : ?
Which cells in the eye are responsible for scotopic vision? None of these Both ‘a’ and ‘b’ Rod cells Cone cells TRUE ANSWER : ? YOUR ANSWER : ?