Originally Posted by
Guy Roland
It may be to split the bulbs. 4 bulb fixtures can be wired 2+2 what I mean is if you have 6 fixtures in your shop you can wire the two inside bulbs on each fixture to one switch and the outer 2 to a second switch.
This saves electricity as you can run half your lighting in the daytime or for normal work or turn on all bulbs for nightime or more critical work.