Kitchen & Bath Lighting. A good lighting design should:. Look good – both people and design space Provide the proper amount of light in every room Be built and constructed within budget, code, and other constraints in mind Be environmentally responsible
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Kitchen & Bath Lighting
decorative
focal
task
ambient
ambient
decorative
General Lighting
General Lighting
Distance = Lamp Ht. –workplane height
Distance = 96”-36” = 60”
How do we measure the light on a work surface?
Lux = FC x 10.76
FC = Lux x .0929
Let’s talk about another form of measurement in lighting
5’
144 footcandles
50 footcandles
640 footcandles
The beam angle is defined where candlepower drops off to 50%
From 50% to 10% is called spill light
Color and Reflectance
Color Temperature
Cool colors
Warm colors
Color Rendition Index
Example – 10’ x 10’ kitchen
Determine the total wall area
10’ x 8’ = 80 x 4 = 320 SF
Divide the room into three predominate materials.
50% is cabinetry (~160 SF)
20% is windows and openings (~64 SF)
30% is wallpaper (~96 SF)
Total = .353 The average wall reflectance is 35%
Average the totals:
Ceiling – 80%
Walls - 35%
Floor - 25%
Average = 47%
Lighting Spacing Principles
Spacing Directional Lamps -
6”
Calculate H the distance from luminaire to 6” above work surface
With a typical 96” ceiling height and a work surface at 36 “ the distance would be 54”
B= 55°
H = 54”
2 (tan27.5° * 54) = ~56” = distance between luminaries
Let’s work an example
This one exists only in a perfect world!
96” Ceiling Height55º Beam Spread
Another Example
This time from the real world
96” Ceiling Height55 Beam Spread
56
56
58/2 = 29
TAN29 = .5543
.5543 x 21 = 11.6411.64X2= ~24
15”
30”
15/27 = .5556
ATAN.5556 = 29º
29°x 2 = 58º
12”/54” = .2222
ATAN .2 = 12.53º
12.53 x 2 = ~25º Beam Spread
Lighting Measurements
Footcandles Levels
Inverse Square Law
Inverse Square Law
Three factors:
Candlepower (Cp)
Footcandle (Fc)
Distance (D)
If you know two factors you can calculate the third.
Candlepower =
Footcandle =
Distance =
CP
D2
FC
1000
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5’