Lighting

Question 1

CCT

Answer 1

Correlated Color Temperature, measured in Kelvins

Question 2

CRI

Answer 2

Color Rendering Index - ability to distinguish colors under a light source
90-100 = excellent
75-85 = good
0-55 = Poor

Question 3

Measured light intensity is ____ proportional to the distance squared from the source of radiation.

Answer 3

Inversely

Question 4

Inverse Square Law
describes the intensity of light at different distances from a light source. Every light source is different, but the intensity changes in the same way. The intensity of light is inversely proportional to the square of the distance between light source and measuring point.

a larger surface area leads to a light intensity that is inversely proportional to the square of the distance, since the same amount of light has to be distributed onto a larger surface area respectively.

So - as you move away from the light source, your light will cover more area but that light is cut in half

Answer 4

Inverse Square Law

Question 5

If you __ the distance between subject and light source, it illuminates a surface area __ times greater than the one before.

Answer 5

double

four

Question 6

indicates % of catalog lamp lumens actually produced

1.2 means that the lamp will provide 120% of normal lumen output

Answer 6

ballast factor

Question 7

lumens over watts

Answer 7

Efficacy

Question 8

N = E * A

F * CU * LLC

Answer 8

Lumen Method
N = number of lamps required
E = the required foot candle level at the task
A = area of the room
F = lumen output per lamp
CU = Coefficient of utilization
LLF = combined light loss factor

Question 9

is a measure of light level in a room

Answer 9

illuminance

Question 10

__ is the evenness of light across an area

Answer 10

scotopic