It works like you’d probably expect — the light moves back and forth between the two players. ... and I was inspired to build a project based on your 1D LED pong, Arduino-style project.

Ottawa is gradually becoming home to some 58,000 LED streetlights — even as a recent health warning has some U.S. cities rethinking the energy-saving strategy.

LED street lights are proven to be cheaper for cities, and more environmentally friendly, b ut health officials in Britain are warning that they also could have adverse health effects on travellers.