How to Calculate How Many Light Fixtures for a Wood Shop
When working on delicate projects with sharp tools, you want to be able to see your subject as clearly as possible, even if your wood shop is in a basement or garage with few windows. Take care to design the lighting system in your shop to provide bright even light in every part of the room.
Things You Will Need
 Calculator
 Tape measure
According to the Cooperative Extension Service of Purdue University, you generally want to have 20 footcandles of light at floor level, which means about 1/2 watt of fluorescent, or 2 watts of incandescent, shop lighting per square foot of shop space.

Determine what size lights you're going to use, and how many bulbs are going to be in each fixture. A standard type of shop light fixture is a 48inch twobulb fluorescent fixture.

Determine how many watts the fixture supports. In the case of a standard 48inch shoplight, it will produce 80 watts of fluorescent light, 40 watts per bulb.

Divide the wattage of each fixture by the number of recommended watts per square feet to calculate how many square feet your fixture will cover. In the case of a standard 48inch shop light, we know from our previous calculation that it puts out 80 watts of fluorescent light, and we know that the recommendation is 1/2 watt per square foot for fluorescent lighting, so that fixture will light 160 square feet.

Measure the floor area of your shop, multiplying the length by width in feet.

Divide the area of your shop floor by the number of square feet that each one of your chosen fixturetype will produce to determine how many fixtures you will need. If I have a 600squarefoot shop, and I'm going to use the 48inch fluorescent shop lights, I'll divide 600 by the 160 square feet that each light will cover, to get 3.75. With lighting, you should always round up, so I'll buy four fixtures.
References
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After working as an editorial assistant for the University of Chicago Press, Dario Saandvik began writing in 2009. He specializes in gardening, home maintenance and computer software. Saandvik has a Bachelor of Arts in English from the University of Chicago and is in the graduate program for English literature at the University of WisconsinMadison.
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