Answered: An unknown lamp placed 6m from a…

An unknown lamp placed 6m from a photometer screen provides the same illuminance as a 90 cd lamp placed 4 m from the screen. What is the candlepower of the unknown lamp?

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)

5th Edition

ISBN:9781305084766

Author:Saeed Moaveni

Publisher:Saeed Moaveni

Chapter12: Electric Current And Related Variables In Engineering

Section: Chapter Questions

Problem 30P

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1. An unknown lamp placed 6m from a photometer screen provides the same illuminance as a 90 cd lamp placed 4 m from the screen. What is the candlepower of the unknown lamp?

2. The illuminance of a room 20 ft x 15 ft is being designed. The illuminance required is 50 footcandles. What is the total required lumens output of the lamp assuming room and luminaire efficiency of 42%?

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