About Keystone Founded over 65 years ago, Keystone Technologies continues to evolve and grow our comprehensive line of highly reliable, electronic, magnetic, and HID ballasts. You will find our products installed by many of the world's leading lighting fixture manufacturers and contractors. They choose Keystone because of our commitment to engineer only the best ballast products for the market. We provide our customers with the most common standard ballast products as well as many custom ballasts that are not available from other manufacturers. Our line continues to grow to meet the changing demands of the lighting industry. We stand behind our products and are only satisfied when we have exceeded our customers' expectations. This commitment has made us a leader today and you can count on us to be the leader tomorrow.