Wakes by humming rather than light

Unfortunately, this does not fulfill its purpose Lichtwecker with me. Instead gently tickle me through the Gradual light from sleep, he wakes me by a sudden onset hum as soon as the lamp lights on the darkest stage half an hour before the actual wake-up call. Who is particularly sensitive to noise, therefore should look like to search for another device. Without the hum I would be quite satisfied with the device.