*Lighting & Electrical Systems

Question 1

What are direct lighting systems?

Answer 1

provide 90%-100% of the light output on the task

Question 2

What are semidirect lighting systems?

Answer 2

provide 60%-90% of the light down and from 10%-40% toward the ceiling

Question 3

What is direct-indirect lighting system?

Answer 3

provide equal amounts of light up and down

Question 4

What is general diffuse lighting system?

Answer 4

all sides. light diffuses into room

Question 5

What is semi-indirect lighting system?

Answer 5

most of the light toward to ceiling some down

Question 6

What is a indirect lighting system?

Answer 6

throw from 90%-100% of all light toward the ceiling

Question 7

What types of bulbs are incandescent?

Answer 7

halogen and xenon

Question 8

What types of bulbs are discharge?

Answer 8

fluorescents and HIDs

Question 9

What types of bulbs are Soild State?

Answer 9

LEDs

Question 10

Define efficacy

Answer 10

A measure of energy efficiency.

Lumens per watt (similar to miles per gallon)

Question 11

What are Xenon bulbs are what are their characteristics?

Answer 11

• Incandescent
  -Xenon gas with warm light
  -Dimmable but not energy efficient because they give off more heat

Question 12

What are halogens and what are their characteristics?

Answer 12

• Bright but hot
• Cheap up front, but cost more to operate and have a short lamp life
  -Dimmable

Question 13

What are fluorescent and what are their characteristics?

Answer 13

-more energy-efficient because they give off minimal heat
- have a harsh white color
- not dimmable without special housing and switching

Question 14

What are LED bulbs and their characteristics?

Answer 14

• Light-emitting diodes
• long-lasting
• Have lower heat and energy use
• lower operating cost but more expensive up front
• require a low voltage dimmer

Question 15

What are High-Intensity Discharge (HID) bulbs and their characteristics?

Answer 15

• includes mercury vapor, metal halide, ceramic metal halide, and high pressure sodium lamps
• Pass an electrical current through gas containing metal vapors. This produces an arc of light

Question 16

Low voltage lighting includes…

Answer 16

incandescent lamps and LEDs

Question 17

Define candlepower

Answer 17

unit of luminous intensity approximately equal to the horizontal light output from an ordinary wax candle (candela)

Question 18

Define lumen

Question 19

Which type of lights can be switched together?
A) LED and halogen
B) LED and fluorescent
C) LED and xenon
D) none of these can be switched together

Answer 19

D) none of these can be switched together

Because different lamp types are used for different purposes, it is not always desirable to switch them together, even when you can. Lights on a dimmer should also be on a separate switch.

Question 20

Which of the following should not be a primary consideration when choosing a light source?
A) aesthetics
B) color rendition
C) efficacy
D) operating life cost

Answer 20

A) Aesthetics

Question 21

When selecting lighting fixtures, which brightness ratio is considered acceptable in a commercial office space between the task and general surroundings?

Answer 21

5:1

Question 22

Which of the following sources would be most appropriate for the warehouse portion of a large furniture dealership?
A) cool-white deluxe fluorescent
B) mercury-vapor
C) high-pressure sodium
D) metal-halide

Answer 22

D) Metal-halide

they have a high efficacy (80 lm/W to 120lm/W) and good color rendition. You’ll often see them used in warehouse-style retail stores like Home Depot and Costco.

Question 23

What are the important considerations of light quality?

Answer 23

glare,
contrast,
uniformity and
color.

Question 24

Where is the junction box for a power pole located?

Answer 24

plenum

Question 25

Which of the following sources would be most appropriate for the warehouse portion of a large furniture dealership?

Answer 25

metal-halide

they have a high efficacy (80 lm/W to 120lm/W) and good color rendition.

Question 26

The designer is working on an office project where company employees are intense computer users (approximately 6-8 hours daily).
Which type of lighting would be most appropriate for this setting?

Answer 26

direct - indirect lighting


distribute light up and down about equally. Indirect systems direct all the light toward a reflective ceiling, where the light illuminates the room by reflection.