Lighting Flashcards
1
Q
What light source is considered to have the highest efficiency
A
High-pressure sodium
2
Q
What is meant by inverse square law
A
Two times distance equals A quarter Lux
3
Q
How is light produced in incandescent lamp
A
Heat of filament equals light
4
Q
Incandescent What percent is heat what percent is light
A
90% heat 10% light
5
Q
What type a lamp provides the best color rendition
A
Incandescent
6
Q
What material is the filament normally made of
A
Tungsten
7
Q
High pressure sodium life
A
24000 hrs
8
Q
Metal halide hrs
A
15000hrs
9
Q
Mercury vapour life
A
Best 24000 hrs
10
Q
Low pressure sodium hrs
A
18000 maybe brighten by 5%
11
Q
Fluorescent hrs
A
7500-20000
12
Q
Incandescent hrs
A
1000hrs
13
Q
Low pressure sodium colour
A
Yellow
14
Q
Mercury vapour colour
A
Blue white
15
Q
Metal halide colour
A
White
