We all have to change a light bulb at some time. A 60 watt bulb used to be the usual for a main light and 40 watt bulb for a table lamp. The higher number of watts (symbol W), the stronger the light. The international standard unit of power known as a watt is named after Greenock's most famous son - James Watt. This is a photograph of a statue of Watt which can be seen right beside the Municipal Buildings in Greenock.
Watt was born in Greenock in 1736 to a well established family. I won't go into the full story, you can read about him here. His improvements to the steam engine kick-started the industrial revolution and the rest, as they say, is history.
So, the next time you have to change a light bulb or have an "illuminating" light bulb moment, just remember the famous Greenockian - James Watt.