Philips has had a series of lights to stimulate the sun during the short day season, that they've been selling in Norway, at least since the nineties. At the moment they've branded them energy up. They are the only brand I've seen selling something like it. But there might be others.

to regulate circadian rhythm you want something that hits melanopsin, which is optimally excited at 484 nm. most LEDs have a gap in the spectrum there. like another commenter mentioned, waveform has some good products with engineered phosphors. they sell some reels of LED and heat sink channels which I used to make my SAD lamp. shitty ikea, costs a little more and you have to put it together yourself. still cheaper than off the shelf SAD lamps though

I've had reasonable luck with full spectrum LED grow lights (quantum board). Though you absolutely 100% need a diffuser. Discovered their efficacy by accident after one winter I shared an office with my house plants.

Though looking at the research they are probably putting out enough energy in the blue spectrum to risk cataracts (so do your own safety research).

I remember a blog post entry on HN of someone who turned their corner office/living room into some sunlight simulated thing with high candela bespoke bulbs. Maybe with the search at the bottom you will find it.

Waveform Lighting makes awesome full spectrum bulbs. You are welcome. ;)

You can't do a 'lumen' lamp. The IR rays are what help. Anecdotally it felt good to cover my hands with the old lamps, and the cfls and LED lights never "felt" good.

I’m not sure what you mean by lumen lamp, but good old incandescent bulbs radiate with a spectrum quite close to that of the setting sun.

Consumer bulbs do not typically emit UVA or UVB, so you can’t simulate the sun with just one bulb.