Philips InstantFit T12 LED Tubes. Installs easily with no rewiring. The Philips InstantFit T12 LED Tube (16T12/LED/48-840/UF18/G) is the fast, easy way to replace T12 linear fluorescent bulbs on most light fixtures with rapid start magnetic ballasts. Its compatible with 50% more ballasts than the competition so you can plug it in and quickly enjoy bright, energy efficient light in kitchens, laundry rooms, garages and more. Tubes provide up to 40% energy savings (compared to F40T12 magnetic ballast systems), turn on instantly and contain no mercury. Based on the next leading competitor and their number of compatible ballasts. Easily replaces T12 linear fluorescent bulbs with no rewiring; Compatible with rapid start magnetic ballasts; Turns on instantly and delivers bright, clear light; Bright, even light for rooms with frequent on/off switching; 36,000 hour lifespan (length of time (in hours) until half of the LED light sources maintain at least 70% of their initial lumen output (B50, L70).