ledbulbsuk writes: "GU10 LED 50w Bulbs are available to buy online at LEDBulbs.co.uk. The operational life of a LED bulb is in contrast to the average life of an incandescent bulb, which is approximately 1000-2000 hours." Link to Original Source
In any problem, if you find yourself doing an infinite amount of work,
the answer may be obtained by inspection.