On average, both wall and ceiling lights will cost you the same if both have the same wattage. For instance, a 100-watt bulb uses more electricity than a ceiling light that only uses 25 watts but a 100-watt bulb will use less electricity than a set of 4 ceiling lights that each consume 50 watts. The eventual cost boils down to the lighting fixture you choose and typically, ceiling light fixtures are more expensive than wall light fixtures.