SL bulbs last 10 times longer than the standard light bulb because they use 60 percent to 75 percent less energy to light up. They are made to substitute for incandescent filament lamps.
SL bulbs are available in low wattage, ranging from 12 watts to 20 watts. SL bulbs are not cheap. You can probably buy 30 standard bulbs for the cost of a high quality SL bulb.
Cheaper SL bulbs are not a wise choice since they do not last as long as the more expensive brands, usually begin to dim after a month and offer less light per watt.