Left: The older, red flashing beacons used 2 lamps inside, each rated at 620 Watts. Assuming a 50% duty cycle, one red flashing beacon would use 5,298 KWH of electricity/year at a cost of $582.73 based on $0.11/KWH.
Right: LED medium intensity red beacons at 20 flashes/minute would use 3.3 Watts/hour or 28 KWH of electricity/year at a cost of $3.10.