All of the Lights

Question 1

Reflection- Control Light

Answer 1

Two Types
Specular Reflection- a highly glossy or shiny surface causes an unaltered beam.
Diffuse Reflection- matte material reflect the light in many different directions
*Semi-Specular- spread reflected beam and smooth out irregularities

Question 2

Type of Reflectors

Answer 2

Spherical
Parabolic
Ellipsoidal

Question 3

Transmission-Control of Light

Answer 3

Light Travels through a material then is absorbed or redirected in different ways as either directed or spread light

Question 4

Refraction-Control of Light

Answer 4

Light is bent or changes direction when it passes through one material to another. Typically a convex or prismatic lense

Question 5

Absorption-Control of Light

Answer 5

The material soaks up incoming light and transmit the desired light only

Question 6

Baffle

Answer 6

Opaque Element of wood, metal, or plastic that prevents direct viewing of a lamp.
*Horizontal baffles reduce brightness more than vertical baffles because each produces a shadow on the baffle below

Question 7

Louver

Answer 7

Assembly of vertical baffles arranged parallel in a grid or concentric pattern to block high luminaire brightness
* specular parabolic louvers mix reflective principles to direct downward light. *** Commonly used in business offices

Question 8

Horizontal Illuminance

Answer 8

a measure of the lumens per unit area on a horizontal surface

Question 9

Lux

Answer 9

a measure of illuminance weighted to the spectral activity of the human eye.. Lux =1 lumen per square meter

Question 10

Footcandle

Answer 10

1 Footcandle =10.746 Lux