This new bulb is a hybrid halogen-compact fluorescent that combines the instant brightness of halogen technology with the energy efficiency of CFL. Offering eight times the life of an incandescent, the bulb comes on instantly, allowing the bulb to be noticeably bright in less than half a second. It also possesses low levels of mercury. Cost: $5.99 to $6.99. GE Appliances & Lighting. 800-435-4448.