After consulting many sites and forums, I bought the dawn simulator from Lumie 250. This is a very good device; unlike other it makes no noise when the lamp is working and the radio is excellent. We can associate different sounds (waves, birds and cock ... or radio) to light to be awakened. I have not yet tested the crépuscule.Quelques complaints: can not memorize two different zones for alarm or radio station. Furthermore, I believe that you can not turn off the alarm on the days when we did not need or so I misread the instructions; I must then schedule a later wake-up time. Overall, this is very nice and the device is reliable. However, I note that the price is higher since my purchase in late November. I paid 149 (premium) to Natralforme via amazon.