I bought an alarm clock/light for a partner and she thought is was wonderful for a week. Then she decided she really wanted to sleep all day and declared it a nuisance.

I found the two I have had to be the best way to wake. You get up refreshed and prepared. It progressively brightens to full and then sounds the alarm You can set it to progressively dim at bedtime. The second one was American and it has gone wrong - it was pretty complicated. However the concept is right. But I don't suffer from SAD (AFAIK).

The daylight boxes are harder to use because you have to sit in front of them for an hour or so. And the best time to use those is mid-day. If you can get a good dose of mid-day daylight you will benefit because even normal winter daylight is infinitely stronger than just about anything you can plug-in. The mid-day sun (even behind cloud) re-sets the diurnal body clock and replensishes the seratonin levels which are implicated in sleep and depression problems.

The clocks are about £50 - I saw one in John Lewis the other day.
I bought mine from "Outside In" who sell Light boxes and dinky little "eye shades" that beam light onto whatever you are reading and the eye picks-up the strong signal without blinding others (like with air travel). Not sure how effective they are but they seem to have benefit as reading torches.

here's one web page I found