General Electric Energy Efficient Light Bulb (Pack of 8) - 11w B22 Mini Eco CFL Equivalent to 60w - Save up to £10 per year per bulb : Amazon.co.uk: Lighting
11W CFL Energy Saving Light E27 Full Spiral - Low Energy Supermarket
Watts The Deal? Demystifying LEDs, CFLs, Halogens And More : NPR
TCP 11w 55w Equivalent ES / E27 Large Edison Screw Compact Fluorescent Light Bulb DAYLIGHT