In 4 days, the light bulb consumes 1800 watt-hours/day x 4 days = <<1800*4=7200>>7200 watt-hours.
In 12 hours, the light bulb consumes an additional 1800 watt-hours/day x 12 hours/24 hours = <<1800*12/24=900>>900 watt-hours.
Therefore, the light bulb consumes a total of 7200 watt-hours + 900 watt-hours = <<7200+900=8100>>8100 watt-hours in 4 days and 12 hours. Answer: \boxed{8100}.
A light bulb consumes 1800 watt-hours per day. How many watt-hours does it consume in 4 days and 12 hours?
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