The Philips BSN 150L 407 ITS Emergency Copper Ballast Product No. 9137 002 139 is a reliable and high-quality lighting ballast designed for emergency situations in office, business, or industrial settings. With the trusted Philips brand behind it, this ballast ensures a consistent and safe power supply for your facility lighting. Ideal for maintaining safety and visibility during power outages or maintenance procedures, this product is a valuable addition to any business or industrial facility.