Ordinary incandescent surface mount fixtures give less light using more power, but that is fine for closet, stairway, pantry, woodshed, battery room, for short usage where efficiency makes little difference. Low prices make it easy to add many convenience lights throughout your home. Use them on outside porches since they are not affected by extreme cold like fluorescents. Uses 2 amps.
Low cost but not efficient use of power. Used in seldom lit areas in closet or woodshed. Operate direct from 12 volt DC. Two of these may be wired in series for 24 volt, easier to obtain than 24 volt screw in bulbs.