Looking for a traditional style bulb with a stylish aesthetic without compromising on energy efficiency Take a look at this model from the Osram Parathom collection. This GLS bulb uses just 4 Watts of power to provide a crisp bright Cool White light output at 4000 Kelvin at the equivalent power output of a traditional 40 Watt halogen lamp. This model has been designed with an easy to use Edison Screw (E27/ES) base-type and an elegant clear finish.