Contract Documents Flashcards
Where should air supply diffusers and registers be located?
Near windows or other heat loss sources or heat gain
Where should return air grilles be placed?
Away from supply points (facilitates heat and air circulation throughout the space)
What is a diffuser?
A device used to direct air supply by angled blades
What are the 3 types of diffusers?
lourve bladed, straight bladed, and linear slot
What is a grille?
A device used to supply or extract air without any deflection
What are the 3 types of grilles?
egg crate, bar type, and transfer type
How many Kelvins is natural daylight?
9,000K very cool blue
the ___ the color temp, the ___ the light will appear
lower, warmer
What is used to describe the color temperature of non-incandescent lights?
CCT (correlated color temperature)
____ refers to the way colors appear when viewed under a given light source.
Color rendering
What’s the CRI of a lamp type?
0-100 (0=poor; 100=best color quality)
What CRI is typically acceptable?
80 or higher
What lamp type generates light when an electric current heats the tungsten filament inside?
incandescents
What’s the typical color of an incandescent?
warm white (2700K) / high CRI for rendering natural color and skin tones
Downside to incandescent?
poor efficacy
What lamp type is bright but hot, cheaper upfront but costs more to operate, shorter lamp life, can be dimmed?
Halogen
What lamp type is energy-efficient, minimal heat, typically brighter than LEDs, but has harsher whiter colored light? Not dimmable without special housing and switching. Suitable for commercial spaces where the light stays on.
Fluorescent
What lamp type requires a larger-sized transformer to “step down” the voltage from 120 to 12 volts? They tend to be smaller in size and have more beam control.
low voltage (incandescent like MR16)
What lamp type has a long life, low energy use, lower operating costs but are currently more expensive upfront? They have low heat output and a relatively cool bluish light. Some are dimmable, but this requires a special dimmer.
LED
What lamp type is most often used for outdoor lighting or large indoor spaces, like warehouses? They generate light by passing an electric current through a gas. That current then produces an arc of light within the arc tube. Requires ballast.
High-intensity discharge (HID)
What are different types of HIDs?
High-Pressure Sodium (HPS), Mercury Vapor, Metal Halide, and Ceramic Metal Halide
What lamp type is an incandescent fixture with xenon gas have warmer light and give off more heat? They are dimmable but not energy efficient and have a lamp life similar to fluorescent, but not as long as LED.
Xenon
The units used for the measurement and description of the brightness of a direct glare source are
candela per square meter
___ describe brightness either reflected or transmitted from a source or surface (luminance), and account for the projected area (i.e., only the area that you see when looking at the source). It is measured in candela per square meter.
foot lamberts
The amount of light output produced by a lamp or light source; this is how lamp manufacturers rate their lamps and publish catalogs with this information:
Lumens
