Flash Technology High Intensity Obstruction & Tower Lighting - SPX Corp Description: -- High intensity tower lighting is referred to by the FAA as C-type or F-type towers. C-type towers refer to high intensity systems utilizing white lighting for day and night. C-type towers utilize a white AOL L-865 beacon and multiple white L-856 high intensity strobes depending on tower height. F-type towers refer to high intensity systems utilizing white lighting during the day and red lighting during the night. F-type towers utilize a dual AOL L-864/L-865 beacon, multiple red L-864 beacons and multiple white L-856 high intensity strobes depending on tower height. We offer red and white Xenon and LED systems that can be used in high intensity applications. Catenary systems are also available. Our products are ETL certified and are widely used throughout the United States, Canada, South America, and Europe. Please review our products page and contact us if you have any questions.