sunray clock doesn't come on gradually?

I've just bought a second hand Lumie Sunray bodyclock and I'm trying to get it working. I've got the intruction leaflet, and have followed what it says. But somehow I'm not getting a gradually sunrise. At the appropriate wake-up time, the beeper comes on, and so does the light, going from nothing to full-brightness in about a second. I thought that it was supposed to take 30 minutes. The bulb seems to be working, as I can press the up and down buttons to fade it in and out, but for some reason it doesn't work like that with the wake-up function. Any ideas?

yeah, thanks, I guess that's probably my next option, presuming that I haven't missed something in the set-up.

I'm having the same problem with mine. I set it for 7.15am, it starts coming on at 6.45am but the light doesn't get any bighter until 7.15am when the back up alarm goes off.......so waste of time really. This is the second one I have had that has had a problem with it. Think I need to send it back to Lumie, just haven't had the time. The first one was great and did what it said on the box at first but then went wrong when it was about 8 month old.