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Name 5 diff types of Housing that contain the electrical connection to the power source?
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Definition
Name 5 diff types of Housing that contain the electrical connection to the power source?
- Recessed
- Semi Recessed
- Surface Mounted
- Pendant Mounted
- Track Mounted |
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Term
What is Recessed Housing?
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Definition
| Housing that is mounted above the ceiling line or below the floor line; only the aperture (opening) is visible from below |
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Term
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Definition
| This housing is mounted partially above the ceiling line with part of the housing visible from below |
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Term
| What is Surface Mounted mean? |
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Definition
| Means fixture is mounted to the surface of the ceiling or wall; because it is visible it should be more decorative than other previous forms |
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Term
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What does Pendant-Mounted Mean?
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Definition
| This type of housing hangs from the ceiling by a chain or cord or rod; may also provide indirect light in the space or simply bring the lamp closer to the surfaces below in the case of very high ceilings |
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Term
| What does Track mounted mean? |
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Definition
| This housing has lights that are attached to a recessed, surface mounted or pendant track; allows the electrical connection to extend past where it is physically connected to the building by adding wiring to the track |
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Term
Light control
Accomplished through the use of what 3 techniques? |
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Definition
These 3 techniques determine ______ _______
- Reflectors
- Spacing
- Mounting Options |
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Term
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5 different types of lights used to control lighting
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Definition
5 different types of lights used to control lighting
- Down Lights
- Wash Lights
- Object Lights
- Task Lighting
- Multi-directional Lights[image] |
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Term
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Definition
| Also called direct luminaires, these produce downward light that is usually symmetrical; may be used in groups to provide ambient light or singly to provide focal light |
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Term
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Definition
These lights are mounted in a reflector that controls the distribution and brightness
Shallow-contour
Directional source |
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Term
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What are Rectilinear Fluorescent Downlights?
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Definition
These lights are often called troffers;
common sizes are 1’ x 4’, 2’ x 4’, 2’ x 2’
creates a non-directional effect on the ceiling plane since there is not a long edge to direct the eye one way or another like the other sizes. These sizes are commonly used because they can be integrated into a suspended ceiling grid pattern |
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Term
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Definition
| Diffuses light with lenses, louvers, & reflectors redirect light to reduce glare |
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Term
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What are 3 types of Rectilinear fluorescent down lights?
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Definition
- Prismatic Lens[image]
- Egg-Crate Louvers [image]
- Parabolic Louvers [image] |
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Term
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What 4 things does following the spacing criteria do?
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Definition
- Sets Maximum allowable spacing between fixtures
- Aims to provide uniform luminance
- Easiest way to compare fixtures
- Estimated Ratio of spacing to mounting height |
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Term
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What is a luminous ceiling?
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Definition
| This provides direct downward distribution of light that shines through a large section of translucent material |
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Term
| What does Wash Light mean? |
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Definition
To provide an even wash of relatively uniform brightness, usually on a wall
[image] |
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Term
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What are Asymmetrical Wall-Washers?
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Definition
Angled Ceiling lights used for lighting walls and artwork,
- may also provide ambient light; use reflectors and directional lamps to direct light.
- Designed to resemble other downlights so they can be used in combination with them in the same space |
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Term
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What is a Linear Wall-Washer?
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Definition
A continuous slot is placed in the ceiling with wall-washers in the cavity above,
[image]
- may be incandescent or fluorescent;
- fluorescent lamps should be at a 1:4 ratio for the distance away from the wall to the height of the wall.
- Fixtures mounted at ratio closer than 1:4 provide grazing light that highlights texture of surface |
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Term
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What are Fluorescent uprights?
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Definition
These lights are are used to provide even illumination on the ceiling; good for high ceilings where lights can be positioned far enough away to avoid bright spots
[image] |
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Term
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What are Architectural coves?
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Definition
provide ambient light in spaces by directing light toward ceiling;[image]
often used to supplement other methods such as downlighting. Fluorescent lamps are often used in these areas; should overlap at the ends to avoid gaps in light |
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Term
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Definition
| Light targeted at one or several objects; used to provide focal lighting and contrast to an environment. [image] |
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Term
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Definition
| provide a light source that is close to the surface or task; often mounted under a cabinet or shelf |
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Term
| What is Soffit Task Light |
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Definition
| This encloses the lamp and directs all light downward; often used in niches |
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Term
What is direct-indirect lighting
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Definition
| Provides downlight and uplight; helps create a smoother appearance to overall lighting in the space |
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Term
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Definition
These are similar to valance lighting, but placed high on a wall that does not have a window
[image] |
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Term
| Low voltage lighting can include incandescents like what? |
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Definition
| MR16s (usually a halogen, or type of incandescent) and LEDs |
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Term
| Is when the light from a fixture or lamp falls on a specific area or an object. ... Downlights & spotlights are a great example of a ––––––– ––––––– since they only illuminate downwards. |
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Definition
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Term
| Refers to fixtures that direct the light upward to bounce off of the walls or ceiling to light the room. |
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Definition
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Term
| Examples of lighting used to enhance function in a space |
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Definition
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Term
| –––––––- –––––––– lighting is employed in applications where strong light is not necessary e.g., stairways, corridors, and storage areas. |
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Definition
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Term
| –––––––– scheme is primarily used for indoor light decoration purposes. |
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Definition
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Term
| This type of lighting is employed in applications where strong light is not necessary e.g., stairways, corridors, and storage areas. |
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Definition
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Term
| –––––––– provides overall illumination and is meant to create a general and uniform lighting level. |
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Definition
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Term
| How do you calculate Recessed Can Lighting |
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Definition
Divide Ceiling height by 2 to space cans
Exp - 8' Ceiling / by 2 = 4' apart |
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Term
| How do you calculate Foot-candles? |
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Definition
| Footcandles (fc) = Total Lumens (lm) ÷ Area in Square Feet |
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Term
| How do you calculate Lumens needed for an area or LUX? |
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Definition
1 Lux (lx) = 1 Footcandle (fc) x 10.76
Lux = Total Lumens ÷ Area in Square Meters |
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Term
| How do you calculate the Maximum Allowable Spacing Between Fixtures? |
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Definition
Fixture Spacing Criteria x Mounting Height
Fixture Spacing Criteria: See the manufacturer's literature |
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Term
| Axial spacing between fixtures = Length of room / Number of fixtures in each row |
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Definition
| Length of room / Number of fixtures in each row |
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Term
| Transverse spacing between fixtures = |
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Definition
| Width of room / Number of fixtures in row |
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Term
| Number of rows of fixtures required = |
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Definition
| Width of room / Max. spacing EXP. 10 / 2.25 |
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Term
| THE WATTAGE FORMULA (Watts per Square Foot) |
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Definition
General Lighting: room’s square footage x 1.5W
EXP - 10'x10' room = 100SF x 1.5W = 150W for general use
Work or Study Rooms: room square footage x 2.5W
EXP - 10'x10' room = 100SF x 2.5W = 250W for Work/Study |
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Term
| THE LUMEN CALCULATOR FORMULA (Lumens per Square Foot) |
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Definition
Lumens per square foot or a foot-candle or lux is the amount of light an area is receiving
To do this calculation, you have to:
Measure your room’s dimensions. E.g. 10-by-10 feet.
Calculate the totals sum of the lumens produced by all of your light sources. Lumen output is often indicated on the fixtures’ packaging or manufacturer website.
Divide your total lumen output by your room’s square footage.
For example:
If your 10-by-10 foot room is a bathroom, experts recommend that the lux should be close to 75 lumens per square foot.
Therefore, by multiplying 75 by 100, your fixtures need to yield at least 7500 lumens of light in total. |
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Term
| Recommended Lighting Levels |
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Definition
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