Model: LU50 Energy Used: 50W Voltage: 120V Color: 2100 Finish: Clear Lumens: 4000 Base Type: E39 Mogul Screw Bulb Shape: ED-23.5 Rated Avg Life: 24,000hrs Burn Position: Universal Brand: PlusRite Length: 7.75" Diameter: 2.938" ANSI Code: S68 UPC Code: 46677368678 Additional Information about the Product: Our High Pressure Sodium light bulbs have yellowish/white color out and are used in security lighting. We offer these security lights in various wattages from 35W to 400W. They are used in warehouse lighting, roadways, industiral aplications and security lighting such as shoebox and flood light fixtures. They are mostly seen in high bay warehouse situations where energy efficiency is very important. All of our HPS Security Lamps are top quality and have a long life and are a very reliable light source.