Maintenance Engineering's Lumi-Twist, compact fluorescent lamps premium quality construction includes a balanced spectrum by using rare earth phosphors, these special phospors improve color rendition and light output. Rare Earth Extended Life Phosphors stay brighter longer, and have minimal color shift over their lifetime. Our high temperature rated electronics are designed for long life and are rated for commercial and industrial applications. Maintenance Engineering's internal electronic ballast has a soft start design, which extends lamp life. By replace an incandescent lamp with a Lumi-Twist you can save up to 83% on your electric bill.