UK's first LED street lights are installed in Bath and North East Somerset Council at the Hicks Gate roundabout at the Bristol end of the Keynsham, Somerset.

Previously, Bath and North East Somerset used 250 watt high pressure sodium lighting on the Hicks Gate roundabout. On June 10, they were replaced with the 169 watt LED lights, saving 40 per cent of its energy and a further 20 per cent due to the dimming technology.

Each lamp contains more than 80 tiny bulbs, which have a life span of 60,000 hours or around 16 years when lit for 10 hours each day - five times that of a traditional street lamp.

The lights are expected to save taxpayers more than £4,500-each-year - as well as 25 tonnes of carbon emissions.

It will take eight years for the LED lights to repay the costs of their manufacture and fitting, which currently stands at £36,000. The trial is set to finish by the end of the year.