Another thing I'd highly recommend for people struggling with shorter days is the Philips SmartSleep Wake-up light [1]. The price is a bit insane for a light, but it's so much gentler than cheaper no-name options I've tried. It has a very dim starting brightness, the "steps" as it ramps up are imperceptible, and the color gradually shifts from very warm to less warm.

I don't think this will help at all in the way of SAD treatment (not bright enough), but it does make mornings more pleasant.

[1] https://www.amazon.com/Philips-Simulation-Headspace-Subscrip...

I have this and love it. Underrated is its wind-down feature at night, where you press a button to turn it on at full brightness, then over a period of time you set (I have mine at 45 minutes) it gets redder and dimmer, like a sunset. I've found it a great way to slow down at the end of the day.

I do wish it had day-of-week alarms, so it'd automatically wake me up at the same time each day. As it is, if I forget to set it today, it won't go off tomorrow. That said, almost every alarm clock I've ever owned has been like that so it's not some egregious failure. Out of habit, when I turn off the alarm each morning, I press the button again to turn it back on so it triggers a day later.