Be a Gentleman by Jason Bruges

The work of interactive designer and architect Jason Bruges is always intriguing and thoughtful. He built us a brilliant domestic intervention by hacking a switch to transform it into a well-spoken gentleman who thanks us each time we flick the lights off in an empty room.

Why?

Leaving one light on for one day only wastes a fractional amount of electricity and might only cost you a few coppers. However, if you make a bad habit of it and leave multiple lights on every day for the rest of your life, we’re wasting thousands of pounds, not just a couple of pennies.

How?

It may be an old school green tip, but switching off the lights is a pretty bright idea. An even brighter idea is switching to LED lights. This article by the Guardian gives you everything you need to know about replacing old, inefficient bulbs with better ones.