A lightbulb produce 1 million lumen in ~600 hours, or about 2 months of daily usage.

In the chart below you can see the price of 1 million lumen per hour in British Pound, adjusted for inflation, since the Middle-Age.

In 1300 the cost of 1 million lumen was 40.000 pound….today is 3 pounds.

So many things we take for granted used to be such luxuries.