Preheat T5 Energy saving lamps over T8 and T12 lamps.;Small profile. Philips T5 Fluorescent Lamps are incredibly powerful, environmentally responsible, long life lamps with an ultra-slim profile. This translates into reduced maintenance and disposal costs and also allows the use of smaller fixtureswhich reduces ceiling clutter. Require a starter or preheat switch. Several seconds of warm-up time is required before starting.;Available in 4, 6, 8 and 13 Watt Cool White, 6 and 8 Watt Daylight, 8 Watt Warm White, 8 and 13 Watt Ultralume. Ideal for use in under cabinet lighting.