At the turn of the century (not this) there was extensive research into light bulbs, just like there is today in computers. A range of materials were used and there was competition to offer the longest bulb life. This meant that bulbs with 10,000 hour life were sold.
There are 8760 hours in a year, which means that this bulb has been on for more than 876,000 hours. That is close to a million hours!!!
