(20 Pack) 40S11/N 40-Watt S11 E17 Intermediate Base Hi-Intensity Light Bulbs,... Price Includes 20 40-Watt S11 Hi-Intensity Light Bulbs Equipped with a heavy-duty filament allowing for a LONGER LIFE & Durability Base: Intermediate Base E17 (slightly smaller than standard base) Traditionally used in signs, marquees, desk and reading lamps Incandescent Light Bulbs for Residential and Commercial use