Light is too short

Have the light f. The kitchen bought a light above the sink, so I have to lay no annoying cables. The brightness and the light color are ok, only the lamp always goes out after 33 sec, regardless of whether there is moving a person or not. Then it takes about 4 seconds until you get back has light. I thought it was getting no continuous light as the sensor switches for example el.Aussenlicht, but you can, what annoys quite nice if you want to seriously get some work done.