Rough Service Incandescent Lamps An exceptionally strong filament resists shocks, bumps and vibrations. Philips Family of Specialty Incandescents provide the perfect light for dramatic accents and display lighting as well as general lighting in a variety of applications.Rough Service incandescent lamps have an exceptionally strong filament for which a special filament wire is used, which makes these lamps extremely suitable for places where shocks, bumps and vibrations frequently occur. The clear version, with its completely visible filament, is a brilliant light source, whereas the inside-frosted lamp is used wherever well diffused light is required. Rugged design resists vibration.;Incandescent, vacuum or gas-filled lamp with clear or inside-frosted bulb.;Single coil filament.;Medium or mogul screw base.;Available in 60W and 75W versions in clear and frosted. Also available in 100W TuffGuard version. IdeaI for use in worklights and other fixtures subject to rough handling. Suited for Ships, engine rooms, mines, elevators public transport buses and trains and other industrial applications.