I have just been comparing the different Bodyclocks available to buy (http://www.lumie.com/shop/comparison/dawn-simulators) and I've noticed a feature called "Sun ray effect". It seems that the ADVANCED 200 and ELITE 300 doesn't include it, but the rest does. What exactly is this sun ray effect?
What we call the 'sun ray effect' is simply the effect made on the wall or whatever's behind the Bodyclock. You can see it in the picture here : http://www.lumie.com/shop/
The lamp covers need vents and the ones on Active and Starter just happen to create a nice effect! Advanced and Elite have glass lamp covers and these are vented differently so there's no sun ray effect with those.