The B43 and C4 tower types are over 1050′ tall but not more than 1400′ excluding any appurtenances and are lit by 12 flashing L-856 white high intensity beacons.
B4 Towers
- B towers have no appurtenances greater than 40′ so no L-865 beacon is required
C4 Towers
- C towers have appurtenances greater than 40′ and 1 L-865 white medium intesity beacon is required on top