Honeywell / H&P Hughey Phillips Obstruction Lighting Flashguard 3000B Medium Intensity Dual Lighting System : Description - Obstruction Lighting Flashguard 3000B Medium Intensity Dual Lighting System combines a daytime white strobe light and a nightime red flashing strobeinto a single flashhead, eliminating the need for two separate lighting systems. The flashhead is powered and controlled by a power supply that can be mounted remotely at the base of the structure. The power supply constantly monitors the operation of the system, and provides alarm contact closure upon any failure. The system automatically switches between day, twilight, and night intensities by the use of a calibrated photocell. FlashGuard 3000B flashheads incorporate a light blocking strip that minimizes ground scotter light, resulting in a "community friendly" lighting system.