Nostalgic ST18 Medium Base Thread Filament bulb is an excellent replica of antique light bulbs and is the perfect complement to any vintage or contemporary decor. Available in a 40 and 60 watt option in Amber Light (2200K color temperature) or Smoke (1800K color temperature). Features defined steeple and intricate filament design giving off a warm, amber glow. Lamp Type ST18. 120 Volt. E26 Medium base. 3,000 hour average lamp life. 2.25 inch diameter x 5 inch height.