In my 2 car attached garage.. I went with a 5000 kelvin CFL rated @ 250 incandescent, 55watt nominal.. simple easy, and best of all they are a screw in bulb...
the porcelain base was 1.19 x2, knockin boxes were 2.29, the bulbs were 14.95 when I got them 4 years ago.... 50' of 12-2 romex...