Lighting

Question 1

What are the lighting measurements we use?

Answer 1

Lumens (or Lux): Measures perceived power of light, the amount of visible light that actually falls on a given surface

Footcandle: Measurement of illumination or light density

1 FOOTCANDLE = LIGHT INTENSITY OF 1 LUMAN/SQ FT

Question 2

What does Correlated Color Temperature [CCT] vs Color Rendition Index [CRI]

Answer 2

CCT measures kelvin temperature (warm to cold)

while CRI measures the ability of light to reproduce the colors of objects faithfully

Question 3

What is an appropriate application of Warm lighting 3000K

Answer 3

Restaurants
Hotel Lobbies
Boutiques
Libraries
Office areas
Retail Stores

Question 4

What is an appropriate application of Neutral lighting 3500K

Answer 4

Public reception areas
Showrooms
Bookstores
OFfice Areas

Question 5

What is an appropriate application of Cool Lighting 4100K

Answer 5

Office Areas
Conference rooms
Classrooms
Mass merchandisers
Hospitals

Question 6

What is an appropriate application of Daylight Lighting 5000K

Answer 6

Galleries
Museums
Jewelry stores
Medical examination areas
Printing companies

Question 7

Define Strike Time

Answer 7

The amount of time it takes once turning on a switch for the lamp to reach full brightness

Street Lights with mercury vapor can take up to 15 minutes

Question 8

How does incandescent lighting work?

Answer 8

Electric current runs through the base into the filament

The filament heats up and turns into incandescence producing light

Question 9

Give a benefit of incandescent lighting

Answer 9

Easily Dimmable
Low initial cost

Question 10

What does the number following the T for Fluorescent Light Tubes mean?
EX. T5, T8, T12

Answer 10

The diameter of the lamp in 1/8’’

Question 11

What does a Ballast do?

Answer 11

Ballast act as a mini transformer in the lighting circuit
They can be integrated into the lamps

-Gives off heat
-Make noise (older ones)
-Does not dim well
- Older ballast can cause low power factors

Question 12

Give some examples of Electric discharge lighting

Answer 12

High intensity discharge lamps (HID)
Mercury Vapor HID lamps
Metal Halide HID lamps

Question 13

How do we remove heat from a LED?

Answer 13

Using a heat sink to absorb and dissipate heat

Question 14

What are Efficacy and Light Efficacy

Answer 14

The capacity to produce an effect

Light Efficacy: How well a light source produces light

Question 15

Describe Light Schemes: Task Lighting

Answer 15

Specific Lighting on a work surface
Ex.

-Desk lamp
-In a dim restaurant, task lights that are positioned over each table
-Light at lavatory (i.e sink) in guest bathroom

Question 16

Describe Light Schemes: Ambient Lighting

Answer 16

Hidden light source that washes the room with a glow

For instance. you have lights focused upward, in a design that casts a reflection, instead of having direct downward lighting
Often used to set a mood

Question 17

Describe Light Schemes: Accent Lighting

Answer 17

Focused on a specific object.
EX.

-Light fixture attached to framed art
-Most bar have accent lighting focused on the liquor bottles

Question 18

Describe Light Schemes: Dimmable Light Lighting

Answer 18

Ability to modify lighting settings to create a specific mood or environment

Question 19

Describe Light Schemes: Uniform Lighting

Answer 19

Down Lights spread evenly across an area
EX.

-Any big box retailer like target