A flat luminaire with dimensions 1.2 x 0.2m is mounted in a ceiling. The luminaire has an opal plastic plate at the bottom and can be considered ideally diffuse. On a wall in the room is placed a picture with dimensions 0.4m x 0.4m, as shown on the figure. The goals apply from the midpoints of resp. luminaire and picture. 2 m Armatur 1 m image The light flux of the light sources is 6200 Im. The brightness normally from the bottom of the luminaire is 1400cd. 1.1 Determine the flux of light from the luminaire. Determine the efficiency of the luminaire. Use the vector method to determine the average illuminance as the luminaire gives in the picture. [Number answer: 108 lux]

A flat luminaire with dimensions 1.2 x 0.2m is mounted in a ceiling. The luminaire has an opal plastic plate at the bottom and can be considered ideally diffuse. On a wall in the room is placed a picture with dimensions 0.4m x 0.4m, as shown on the figure. The goals apply from the midpoints of resp. luminaire and picture. 2 m Armatur 1 m image The light flux of the light sources is 6200 Im. The brightness normally from the bottom of the luminaire is 1400cd. 1.1 Determine the flux of light from the luminaire. Determine the efficiency of the luminaire. Use the vector method to determine the average illuminance as the luminaire gives in the picture. [Number answer: 108 lux]

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Applications Of Reflection Of Light

When a light ray (termed as the incident ray) hits a surface and bounces back (forms a reflected ray), the process of reflection of light has taken place.

Sign Convention for Mirrors

A mirror is made of glass that is coated with a metal amalgam on one side due to which the light ray incident on the surface undergoes reflection and not refraction.

Question

A flat luminaire with dimensions 1.2 x 0.2m is mounted in a ceiling. The luminaire has an opal
plastic plate at the bottom and can be considered ideally diffuse.
On a wall in the room is placed a picture with dimensions 0.4m x 0.4m, as shown on
the figure. The goals apply from the midpoints of resp. luminaire and picture.
2 m
Armatur
1 m
image
The light flux of the light sources is 6200 Im. The brightness normally from the bottom of the luminaire is
1400cd.
1.1 Determine the flux of light from the luminaire.
Determine the efficiency of the luminaire.
Use the vector method to determine the average illuminance as
the luminaire gives in the picture. [Number answer: 108 lux]

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