100 WATT - F20 POST LIGHT - MEDIUM BASE - DECORATIVE LIGHT BULB - LONG LIFE INDUSTRIAL GRADE - REPLACES PHILIPS 100F20/POSTLT/CL/LL BULB - Bulborama Industrial Grade lamps are engineered to last up to 10 times longer than standard bulbs, therefore reducing operational and maintenance costs, and saving both time and money. Industrial Grade lamps are built with brass bases to prevent socket corrosion and multi-support filaments to resist shock and vibration in any burning position.