Saving 85% is easy with this bulb and you can do this for a long time as this bulb is pure aluminium construction and is made to last for up to 20 years.An investment which can last more than you think. Dimmable option is available in this bulb and 7 Watts version too. Check out other products at lightnshine.co.uk. Like other products this bulb comes with 3 years warranty.
http://www.lightnshine.co.uk/collections/gu10/