Philips Family of Specialty Incandescent bulbs 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.