I got one of these at the end of last year.Its a Philips
and is only about 6" square. It has special light cells - not just a daylight bulb, and you can set it so that it turns off after a set time. I have it in front of me while I have breakfast and its set for 20 minutes so it isn't an inconvenience, I'm sitting there anyway. Its too early to say if it makes any difference, but it can't do any harm and as I'm not a morning person - even in midsummer I will be quite happy with a summer 'reading'!