3 ms·
A 4 watt LED lightbulb left on constantly for a year would consume 52 kWh of energy, costing ~£7.50 at UK prices, releasing ~9.5 kg of CO2, the equivalent of dr
by twic 5y ago
A 4 watt LED lightbulb left on constantly for a year would consume 52 kWh of energy, costing ~£7.50 at UK prices, releasing ~9.5 kg of CO2, the equivalent of driving 23.5 miles in the average US passenger vehicle.
There are good reasons for turning off lights in the house (getting a good night's sleep is one!) but saving energy is no longer one of them.
- pedantsamaritan 5y agoThere are a lot of light bulbs, though. The LED switch has had meaningful impact on US residential energy usage [0]. IEA reports 38B in LED sales in 2015-2020 [1]. Averaging $10 (high) per bulb, that's 3.8 billion bulbs (including non-residential). Leaving a light on doesn't matter much. Leaving billions on can clearly have an impact. [0]: https://archive.is/RldJl https://archive.is/RldJl [1]: https://www.iea.org/reports/lighting https://www.iea.org/reports/lighting
- kwhitefoot 5y agoThe billions of bulbs have the same proportional impact on the national energy budget as the few in your home have on yours, that is practically nothing. See David MacKay's Sustainable Energy Without The Hot Air, chapter 19. https://www.withouthotair.com/c19/page_114.shtml https://www.withouthotair.com/c19/page_114.shtml