DIY stores, the lamps are very expensive. And Amazon, there are the lamps a few reviews. Thus, the selection is quite heavy like me. The processing is without flaws, the connection was done quickly. The lamp is considerably larger than a 500W halogen floodlight. The lamp is illuminated my driveway. The light is cold white and has been a distinct blue coloration, but fulfills its purpose. From warm white lamps I know better luminous effects, I expected about the Wikrung a 500W halogen lamp. Maybe it is also due to the Lichtfahrbe that the lamp is not perceived as bright. 50W showed my meter, so this statement is true. The quantity of light I can not measure. The next lamp will be a warm white.