Both spotlights SPOTLIGHT#1 and SPOTLIGHT#2 are place at 20 meters from the stage. You want to produce a circle of light of 1meter diameter with the SPOTLIGHT#land a circle of light of 2 meters diameter with the SPOTLIGHT#2
Both spotlights SPOTLIGHT#1 and SPOTLIGHT#2 are place at 20 meters from the stage. You want to produce a circle of light of 1meter diameter with the SPOTLIGHT#land a circle of light of 2 meters diameter with the SPOTLIGHT#2
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Transcribed Image Text:Given the following scene on the stage
Spotlight #1
1 meter diameter
Spotlight #2
2 meters diameter
Both spotlights SPOTLIGHT#1 and SPOTLIGHT#2 are
place at 20 meters from the stage. You want to produce a
circle of light of 1meter diameter with the
SPOTLIGHT#1and a circle of light of 2 meters diameter
with the SPOTLIGHT#2
1) Calculate the BEAM ANGLE of the SPOTLIGHT#1
and SPOTLIGHT#2
2) You want to have an illuminance of 300 lux on Mrs.
Pott (under the SPOTLIGHT#1). What is the
Luminous Flux (lumen) the lamp need to releases
assuming homogeneous distribution of the light in the
illuminated circle?
3) If the lamp used is a LED lamp with an efficacy of 90
Lumen/Watt, what will be the power of the lamp?
4) You want to have an illuminance of 600 lux on the
Beauty and the Beast (under the SPOTLIGHT#2).
What is the Luminous Flux (lumen) the lamp need to
releases assuming homogeneous distribution of the
light in the illuminated circle?
5) If the lamp used is a LED lamp with an efficacy of 90
Lumen/Watt, what will be the power of the lamp?
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