ARCH 3253 - ETECH 2: ELECTRICAL LIGHTING EXAM

Describe the layered approach in lighting design and identify its advantages.

The layered approach in lighting design involves combining ambient, task, and accent lighting to create a balanced and flexible lighting environment. This method enhances visual comfort, increases functionality, and allows for aesthetic versatility in various spaces.

In determining the CU of a fixture, two of the three considered aspects are:

the room's reflectance and fixture efficiency.

Which light source is most likely represented by this spectral distribution curve?

Flourescent

The visible portion of the electromagnetic wave spectrum lies between

approximately 380 nm and 750 nm.

The LED lamp is typically fitted with a heat sink because:

the electric junction cannot be allowed to excessively overheat

which 3 lamps have the highest luminous efficacy?

LED, fluorescent, and high-pressure sodium lamps.

give 2 specific reasons that privilege the use of LED lamps in comparison to fluorescent lamps

1. LED lamps have a longer lifespan than fluorescent lamps.

2. 2. LEDs consume less energy and provide higher efficiency.

The visual comfort probability is an index indicating the potential effect of glare. The threshold (minimum) value for an acceptable VCP is:

0.7, meaning 70% of occupants should feel comfortable with the lighting.

Explain the difference between maintained illuminance and initial illuminance in their use for the lumen method:

Maintained illuminance refers to the average illumination level that should be maintained over time, while initial illuminance is the illumination level provided immediately after installation.

CT is…?

a scale to measure color appearance of light expressed in degree kelvin

In specifying a light source for clothing store display…?

The CRI and CCT of a lamp would be useful references

If a red car is parked under high pressure sodium lamps, the percieved color is

Brown

In designing a store dedicated to carpets display at floor level, the height of the surface is considered equal to

The height of the carpets (0 ft)

The diameter of a lamp is represented in…?

eights of an inch

which lamp requires a driver instead of a ballast

LED lamp

The intensity of light in a particular direction is expressed in units called…?

candelas

In general, ceilings are bright surfaces. Identify one space scenario for which a dark ceiling surface is desirable

Auditoriums