Lighting and Electrical systems Exam 1
Recessed Downlights
Often called Cans or High Hats. A type of direct luminaire. Recessed in the ceiling.
OLED
Organic light emitting diode. Used in ceilings, wall coverings or panels.
PAR lamp
Parabolic Aluminized Reflector
Many halogen lamps are low voltage and required to have a __________ to change primary power.
Transformers.
Chap 3: What are the two ways in which artificial light is measured?
Color Rendering Index (CRI) Color temperature
Chap 3: Stability
Color over a period of time All light sources reduce in intensity over time Some also shift in color This is a critical consideration for high-end retail or museums where color matching is critical
Chap 3: How is light from a LED generated?
Light-emitting diodes More efficient than fluorescent Efficient Sustainable Work well with photovoltaic (PV) panels and storage batteries
Worst CRI
0
The best CRI possible
100
Compact fluorescent lamps are generally between _________ lumens per watt.
50 and 60
Sunlight at Midday is approximately ________ degrees Kelvin
5500
The efficacy of an incandescent lamp typically ranges from________ lumens per watt.
8-15
Direct luminaries
Emit light downward
Indirect Luminaries
Emit light upward
Direct/Indirect Luminaires
Emit light upward and downward but not to the side.
Types of halogen lamps
A, BT, MB, TB.
Diffuse Luminaries
Emits light in all directions uniformly.
Low Pressure Sodium
Emits monochromatic yellow light
A luminaire
Any device that includes a lampholder and the means of electrification and support for that device.
_____ luminaires emit light stronger in one direction
Asymmetric
Chap 3: CRI
CRI: Color Rendering Index - Quality of light This measurement illustrates the light source's ability to render the color of objects correctly. The more wavelength saturated the source, the higher the CRI will be
The energy efficiency of a light source is called ____ and it is measured in lumens per watt
Efficacy
Chap 3: How is light from a Fluorescent lamp generated?
Energy turns to gas and it emits ultraviolet radiation that is converted to visible light by minerals that "fluoresce". 400 times more efficent than Incandescent
The reason that CRI is important
Excellent CRI allows colors to be portrayed accurately
Two schools of thought on LED
First is to develop lamps that will replace all other less efficient light sources Second is to develop fixtures around the geometry of the LED.
Adjustable luminaries
Generally direct luminaries that can be adjusted to throw light in directions other than down. Track lights.
_____ is considered an HID lamp and is yellowish in color
High pressure sodium
Sodium lamp types?
High pressure sodium, low pressure sodium.
Chap 3: Color Consistency
How reliable the color of a light source is compared to other lamps installed at the same time.
HID Lamps discharge
In a high intensity discharge lamp, electricty arcs between two electrodes, creating an intensly bright light. Mercury, Sodium, or metal halide gases act as the conductor.
_____ lamps are the most likely to cause burns or fires
Incandescent, halogen, HID
The amount that the client will spend to purchase and install the lighting
Initial cost
The most efficient lamp
LED
What is a benefit of using a halogen lamp over a standard incandescent?
Longer life Whiter, brighter light is produced halogen gas allows filament to be thinner.
What coating is on a fluorescent lamp that creates a particular light color?
Phosphorous
The reasons that electric lighting sources are better than flame sources in the indoor environment
Pollution and safety
Chap 3: How is light from a Standard incandescent lamp generated?
Principle of incandescence - metal is heated until it glows.
Why is the electronic ballast best for a fluorescent lamp?
Reduces lamp flicker and saves energy and is quiet.
Chap 3: Sources of natural light?
Sun, Moon, Stars, Fire
What are the two parts of downlights?
The can or housing above the building, and the trim installed from below the ceiling.
The color of light that will be emitted from a lamp with a 2700 color temperature
Warm yellow light
Chap 3: Color Temperature
Warm, neutral, or cool. Higher the temperature, the whiter or cooler the light source appears.
Chap 3: Electricity for electric lighting can be generated from natural, renewable sources such as:
Wind Hydro Geothermal Solar
Overcast sky emits this color of light
blue
The color of light that will be emitted from a lamp with a 6500 color temperature
blue
High Pressure Sodium
golden pinkish color
The most inefficient lamp
incandescent
This lamp is the easiest to dim
incandescent
_____ luminaires emit light upward
indirect
_____ are one of the oldest electric discharge lamps
neon
The amount that the client will spend that includes the electricity and the cost to purchase and replace the lamps
operating cost
Asymmetric Luminaries
special Application. Wall washers
The color of light that will be emitted from a lamp with a 5000 color temperature
white
The morning sun emits the color of light
yellow/warm
