Lighting (ALL) Flashcards by Jessica Gahan

What type of light does an incandescent lamp produce?

Warm

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Where are High Intensity Discharge lamps used?

Warehouse apllications or where ceiling heigts are between 12’ - 20’ high

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Do LED give off a cooler or warmer light?

Cooler

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Color temperature in lamps is given what kind of degree?

Kelvin

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If the temperature of a light is higher the light will be what?

Brighter

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Warm light temp ranges are what?

2700K - 3000K

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Cool light temp ranges are what?

3500K - 4100K

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What are warm light temps good for?

Hotels
Bedrooms
Restaurants that want a cozy, warm, and intimate feel
HOmes

Warm, almost yellow-ish light

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What are cool light temps good for?

Offices
Reception areas
Classrooms
Any place you wish to create an inviting feeling

Coolm clean and efficient

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Daylight temp ranges are what?

5000K - 6500K

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What is daylight temp good for?

Accent you wish to highlight
Galleries
Jewerly Stores
Hospitals
Museums

Extremely white, slight hint of blue

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Color rending index is what?

How well a given light source will render color

Qualitly of light

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The higher the CRI number an object will look what?

1-100

Vibrant

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Natural sunlight has a CRI number of what?

100

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Anything with a CRI value of 50 or less will make an object look what?

Unnatural

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General Ambient Lighting fixtures are

Combo of direct and indirect lighitng
Wall scones
Table & floor lamps
Surface mounted
Recessed
Any light that offers a soft and diffused lighitng

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Accent lighting fixtures are

Converts details of the space into a focal point
Draws attenction to a special options or architectural feature
Track light
Picture light
wall washers

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Task lighting fixtures are

Lighting focused on the area where a particular task will be perfomred
Under-cabinet lighting
Pendants over a counter
Reading lamp
FLoor or table lamp

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What drawing is lighitng shown on?

RCP

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Direct lighitng systems provides what percentage of light output on the task?

90 - 100%

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Semi-direct lighting is what?

Splits the output of light
60-90% down (floor)
10-40% up (clg)

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Direct-indirect lighitng is what?

Equal amounts of light btween floor and ceiling

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Indirect lighitng provides what percentage of light output to the ceiling?

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90 - 100%

What is task-ambinet light common in?

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commerical building design

ALL light fixtures are required to be insalled in a box rated for a minimum of how many lbs (NEC)?

When fixtures are located in a Fire-rated assembly, the mechanical part (back end) of the fixture must be what?

Rated | Otherwise, a fully enclosed rated box must be built around it

ALL fixtures located in wet locations must be rated for?

Wet or damp locations

Pendant fixtures over showers must be

* 8' ABOVE the top of tub rim or shower threshold (or floor if no threshold) * 3' away from shower or tub

What is the minimum distance between the bottom of fixxture and storage or clothes in a closet?

6" - 12"

Egress lighting levels at floor level must be what?

1FC (11lux)

Exit Sign illumination lighting level

5FC (54lux)

Office lighitng level

25-50FC

Public spaces lighitng level

3FC

Intensity is what?

* Light at the source * Unit of measure is Candela

Flux is what?

* Ligt that lsow in Air * Unit of measure is Lumen

Illuminance is what?

* Density of light on a surface * Unit of measure is Footcandle

Exitance is what?

* Total light OFF a surface * Unit of measure is lm/ft

Luminance is what?

* Specific off a surface * Unit of measure is cd/ft

1 Candle equals how many FC?

1 FC equals how many LUX?

Candela is what?

Brightness from source | laser beam

Luminaire is what?

Formal name of what we commonly refer to as Light Fixtures

What is circadian rhythm?

Refers to functions within our body that occur approximately every 24-hours. | Light to wake, dark to fall asleep

What spaces are good for Southern sun exposure?

* All living spaces * Family rooms * Living rooms

What spaces are NOT good for Southern sun exposure?

* Any space that requries darkness * Bedrroms * Bathrooms * TV/Theater Room

What spaces are good for Eastern sun exposure?

* Spaces used in the morning * Bedrooms * Breakfast nook

What spaces are NOT good for Eastern sun exposure?

* Spaces that cannot tolerate variable light * Art studio

What spaces are good for Northern sun exposure?

* No daylight required * Storage * Photographers studio * Laundry room

What spaces are NOT good for Northern sun exposure?

Frequently used rooms and sunrooms.

What spaces are good for Western sun exposure?

* Spaces used in the morning * Bedrooms * Breakfast nook

What spaces are NOT good for Northern sun exposure?

Spaces that cannot tolerate variable light

Occupant sensors are required in all

* Classrooms * Confrence/meeting rooms * Copy/Print rooms * Lounges/breakrooms * Offices -open/closed * Restrooms * Storage rooms * Spaces 300 sqft or less that are encloused

Occupant sensors are NOT required where?

* Areas designated as security or emergency areas that are required to be continuously lighted. * Interior exit stairways, interior exit ramps and exit passageways. * Emergency egress lighting that is normally off

Lighting Needs: Watts per SQ FT This is one of the most simple calculations to do and memorize. It consists of Dividing the total watts by the total square footage of an area

Watts per SF = Total watts ÷ Total SF Example: A 2,010 SF room has lamps with a wattage of 6,000 W total 6,000 ÷ 2010 = 2.99 W/SF The formula can be reversed to find the total wattage for the room.

Lighting Load This formula is used to determine how many circuits are required and how many amps per circuit

A(mps) = W(atts) ÷ V(olts) This formula is used to determine how many watts can be on a circuit based on voltage W(atts) = A(mps) x V(olts) This formula is used determine the voltage in a circuit given watts and amps V(olts) = W(atts) ÷ A(mps)

FC Needed (level of brightness) Lumen Method This method is used to find how many footcandles (FC) are needed in a room

E= Illuminance (or footcandles) E = Total Lumens ÷ AREA = lamp lumens x # lamps x # luminaires AREA

Lumen Method Example

Car Showroom You know the lamps specified have 2,200 Lumens each There are 2 lamps per luminaire. There are 14 luminaires total. The room is 25 x 30 How many FC are in this room? Let's do the math 2,200 x 2 x 14 = 61,600 Lumens 61,600 ÷ 750 SF (25x30) Total = 82 FC The answer is 82 FC (sf) in the room.

Lighting (ALL) Flashcards

(57 cards)