Energy Saver 11 WATT Semi Spiral base SES Small Screw 14 mm Diameter of screw threads. Suitable for some valor Blenheim fires E14. Total length 92 mm x Widest 35 mm. Note these lamps are not dimmable. Equivalent energy saving of 80% over standard GLS. 6,400k. 240 volts ac Lumen output 550, when used for now many cooker hoods they last longer and do not blow the control panel in most cooker hoods.