Table C2.1:
Light Intensity Required for Various Activities (Foot Candles).
Purpose
F-c
Purpose
Storage, halls
5
Bedrooms, stairs, dining room
8
Very rough work:
10
kitchen, laundry, sewing,
100
workshop and playroom
15
Rough work or play
20
Close work:
reading, study, sewing,
shaving, drawing
30
Careful work:
fine reading
drafting
dark sewing
F-c
50
60
80
80
Fine and exact work
Extra-fine work
300
40
General illumination will usually require about 3 watts of electric lighting per square foot of floor area, but this is
subject to broad variation as indicated above.
Section Break (Next Page)
Table C2.2: Lighting Requirement For Farm Buildings
Location
Lighting Unit*
Installation
BEEF BARN
100 watt
One unit per 500 square feet of floor
area.
DAIRY
Milkhouse
100 watt
Two units to illuminate interior of bulk
tank, not to be located directly over
tank.
100 watt
One unit over wash area.
100 watt
One unit outside to illuminate area for
milk ceiling.
100 watt
One unit per stall directed at the
udder. This may be a shielded light from
below or from the ceiling.
Pen Barn
100 watt
One unit per 250 square feet of floor
area.
Stall barn
100 watt
Mount on ceiling 20-feet apart; over
feed alleys, 12 feet apart; over litter
alleys.
HOG FARROWING HOUSE
100 watt
One unit per pair of pens or stalls.
Locate over partition.
HOG FINISHING HOUSE
100 watt
One unit per 400 square feet of floor
area.
POULTRY
Brooder house
15 watt
One unit per 200 square feet of floor
area.
40 watt
or 60 watt
One unit per 200 square feet of floor
area.
100 watt
One unit per 20 feet of feed alley and
one for every 250 square feet of pen
area
Milking room
Laying house
SHEEP BARN
Table C2.2: Lighting Requirement For Farm Buildings (Continued)
Location
Lighting Unit*
FARM SHOP
General lighting
150 watt
Local lighting
150 watt
or two
40 watt
fluorescent
Installation
One unit per 200 square feet of floor
space.
One unit per 10 feet of work bench at
4 to 5 feet above the bench.
GARAGE
100 watt
One unit per 250 square feet. Provide
convenient outlets for portable light.
MACHINE STORAGE
100 watt
One unit per 300 square feet of floor
area.
FEED ROOMS
Storage room.
100 watt
One unit per 400 square feet of floor
dust-proof area. Switch outside feed
reflector
Preparation room.
100 watt
One unit per 150 square feet of floor
dust-proof area. Switch outside feed
reflector
HAYLOFT
200 watt
dust-proof
reflector
Locate for general lighting, easy
servicing, and near or over hay
chute. Switch at foot of ladder.
YARD LIGHT
300 watt
or PAR 38
Locate over top of pole 15 to 20 feet
above the ground and where most
convenient. Use multiple switching, or
a light sensitive element for automatic
switching.
*Incandescent with reflector unless otherwise indicated.