Our 3U Compact Fluorescent Bulbs use an electronic ballast, so they turn on instantly. They are availabe in 15,18,20,23,24,and 26 Watt sizes and may be ordered in either warm white (2700K) or Daylight (6400K)colors. They are extremely energy efficient which is important in today's environment. and are rated for 10,000 hour life. Great for Table Lamps, Recessed Lighting and general task lighting applications. Pricing as low as $6.95ea. Also sold in bulk(6pcs/carton).