A 80 watt incandescent light bulb will produce nowhere near close to 20000 lumens, more something along the lines of 1200-1300 lumens thus you would need 15+ ti

A 80 watt incandescent light bulb will produce nowhere near close to 20000 lumens, more something along the lines of 1200-1300 lumens thus you would need 15+ times more to produce the same luminous flux.