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.

there are lots of options online. just search for "happy light" or ironically their proper name, "SAD light"

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.

https://www.benkuhn.net/lux/ maybe?

Indeed it is!

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.

Be careful of eye damage. Cataracts form from certain frequencies of blue light, and IR can damage your retina.

(There was an article about some guy with an IR heater on his desk, which was partially faulty, and emitted too much IR in a certain frequency, and damaged his eyes)

I got a "Happy Light" for my desk that is 10k Lumens. could that be damaging my eyes?

Link to that particular product please? I'll see if I can suss out the spectral emissions. In general, with lights that bright you probably don't want to be looking directly into them anyway, and you may want to add a diffusor if it isn't built in already.

Can you link me?

https://ehs.lbl.gov/resource/documents/radiation-protection/....

My understanding is that typically it isn't an issue, but the hearer malfunctioned, and it was on his desk, and so he was kind of staring at it all day.

I'd take care. Don't stare into the light, for starters.

Thanks for the article. Looks like he got his eyesight back so it wasn't permanent.

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

There are a few other mfgs, Yuji is another great one, but the best price/performance IMO is SunLike from Seoul Semiconductor. They are in GE Sun Filled and Norb SMILE bulbs in the US.

http://www.seoulsemicon.com/en/technology/sunlike/casestudy/

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

Is UV radiation necessary for Circadian rhythm?

No, UV radiation doesn't matter at all for this purpose. The only thing that matters is brightness of the visible spectrum, especially blues and greens. Buy the brightest white light lamp you can find, those that treat Seasonal Affective Disorder are good.

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

mind sharing a bit more of your process on how I could make one?

buy the reels and channels waveform sells, solder them together and connect a power supply.

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.

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).