Stumbled through various reviews on products of Müller-light and have not yet repented. Very nice warm light quality, very similar to the old bulb. Light efficiency correspond quite well to the equivalent section in watts -Light Bulb. It is more likely to expect a little more power. Products make a quality impression and have a reasonable price-performance ratio for Made in Germany. At last there is light when the switch is actuated wurde.Über the life I can not say much. But will all of my "energy saving lamps" gradually replace by passing the same through LED.