Watts are no longer used as the standard measure of light bulb brightness because watts actually indicate electricity usage not light.
Lumens per square foot laundry room.
To figure out the lumens needed based on this figure you would take the total lumens of the lamp you are considering using and divide it by the total square foot.
Once you ve measured the room and calculated the required foot candles it s time to determine how many lumens a space needs.
Multiply your room square footage by your foot candle requirement.
For the average space of 250 square feet you ll need roughly 5 000 lumens as your primary light source 20 lumens x 250 square feet.
Here s an example using a 100 square foot living room.
70 80 lumens per square foot.
When lighting a room you light it by suggested lumens per square foot.
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X 10 20 foot candles 1 000 to 2 000 lumens.
But with an energy efficient led bulb.
Knowing how many lamps you need to adequately illuminate a room or space can be tricky.
In addition to the size of the space a variety of factors such as the activities being conducted and wall reflectance can also play a role.
In the old days when most light bulbs were incandescent a 100 watt bulb indicated a certain level of brightness.
So using the figure above as an example you would be lighting for 120 feet based on 12x10 room.