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A very visual demonstration of how cheap lighting is today (well, since electricity), and how expensive it used to be.
| Year/period | Hours of labour to earn the equivalent cost of 1h of lighting |
|---|---|
| 2020 | 0.0006 |
| 1800s | 5.53 |
| 2000 BC | 57.52 |
Related: consider the impact of nanostructures on improvements to modern LEDs.