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
If a 6600 used paper tape instead of core memory, it would use up tape
at about 30 miles/second.
-- Grishman, Assembly Language Programming