Question 1

Illumination is typically measured in:&#10;A)coefficients of illumination.&#10;B)CCTs.&#10;C)footcandles or lumens.&#10;D)CRIs.

Accepted Answer

Illumination is typically measured in footcandles or lumens. Coefficients of illumination and CCTs are not common measurement units, while CRI measures the color rendering ability of a light source.

Question 2

What are the drawbacks to natural light?&#10;A)It can create a substantial heat gain within a building.&#10;B)It is considered an inefficient light source.&#10;C)It has poor color rendition.&#10;D)All of the above.

Accepted Answer

Natural light can create a substantial heat gain within a building, which can increase the need for air conditioning, and subsequently increase energy consumption. While natural light is not necessarily considered an inefficient light source, it does have its drawbacks such as poor color rendition and the potential for glare. However, in terms of the given options, the heat gain is a more significant drawback to consider.

Question 3

Sarah is considering buying a luminaire with a visual comfort probability (VCP) rating of 90.What does this tell her about the luminaire?&#10;A)Most people would not find this luminaire objectionable due to glare.&#10;B)This luminaire provides a color rendition that is 90 percent &#34;true.&#34;&#10;C)This luminaire is guaranteed to last 9,000 hours before burning out.&#10;D)This luminaire provides a color temperature in the &#34;warm&#34; range.

Accepted Answer

A visual comfort probability (VCP) rating of 90 indicates that most people would not find the luminaire objectionable due to glare. VCP is a measure of the likelihood of glare being perceived by a person using a light source, with higher VCP ratings indicating lower levels of glare.

Question 4

What is the most common type of electric discharge lamp?&#10;A)mercury vapor&#10;B)fluorescent&#10;C)metal halide&#10;D)high-pressure sodium

Accepted Answer

Fluorescent lamps are the most common type of electric discharge lamp. They are widely used in residential and commercial settings due to their energy efficiency and long lifespan compared to incandescent lamps.

Question 5

Some current and most older electric discharge lamps present special disposal problems because they contain:&#10;A)small amounts of mercury.&#10;B)large amounts of lead.&#10;C)trace amounts of radioactive elements.&#10;D)all of the above.

Accepted Answer

Most electric discharge lamps contain small amounts of mercury, which can be hazardous if not disposed of properly. While some older lamps may contain trace amounts of radioactive elements, they are not typically a significant disposal concern. Large amounts of lead are also not generally present in these lamps. Therefore, choice A is the best answer.

Question 6

A light source's ability to provide a perceived color similar to that which results from sunlight is known as the source's:&#10;A)illumination.&#10;B)color code.&#10;C)lumen.&#10;D)color rendition.

Accepted Answer

The ability for a light source to provide colors that appear similar to those seen under natural sunlight is known as color rendition. The other options do not refer to this specific characteristic. Illumination refers to the amount of light produced, lumens measure the brightness of the light, and color code is not a relevant term.

Question 7

Exit signs must operate:&#10;A)only at night.&#10;B)only in dark areas within a building.&#10;C)24 hours a day, every day.&#10;D)during emergencies; at other times, operation is optional.

Accepted Answer

Exit signs must operate 24 hours a day, every day, not just during emergencies. This ensures that they are always visible and fulfill their life-saving purpose in the event of an emergency.

Question 8

Why should plastic luminaires be air-dried?&#10;A)Air-drying them is faster.&#10;B)Wiping them dry might reduce the luminaire's useful life.&#10;C)Air-drying has many safety advantages.&#10;D)Wiping them dry might give them a new static charge.

Accepted Answer

The answer of Why should plastic luminaires be air-dried?&#10;A)Air-drying them...

Question 9

&#34;Strike time&#34; refers to:&#10;A)a lamp's tendency to decrease its light output over time.&#10;B)a property's predetermined schedule for group relamping.&#10;C)the time required for a lamp to reach full output from a cold start.&#10;D)the expected operating lifetime of a lamp.

Accepted Answer

"Strike time" refers to the time required for a lamp to reach full output from a cold start.

Question 10

David, the maintenance manager at the Riaston Hotel, purchased some replacement lamps for the hotel's guestrooms.The lamps have a lamp life of 1,000 hours; this means that each lamp is:&#10;A)guaranteed to last for 1,000 hours before burning out.&#10;B)expected to last for approximately 1,000 hours before burning out.&#10;C)guaranteed to last for 500 hours before burning out.&#10;D)expected to last for approximately 2,000 hours before burning out.

Accepted Answer

Lamp life is typically an estimate of how long the lamp is expected to last before burning out. It is not a guarantee, but rather a general guideline based on testing and industry standards. Therefore, choice B is the best answer as it states that the lamp is expected to last for approximately 1,000 hours before burning out.

Deck 8: Lighting Systems