Hi Sonja,
I also found the alarm sunlight machines to have very crappy reviews for such exorbitant prices.
SO i am now utilizing the Sunshine Science's Indoor Sunshine
cfl bulb on a timer to wake me.
their color rendering index is 95CRI and they are 5300 Kelvin. The color rendering is as close to sunshine as you may be able to find.
There are three sizes.
I use the smallest bulb--15 watt--for waking me. It's not a gradual coming on of the light, yet is better for our eyes than an abrupt other kind of lighting. and the 15 watt is not as bright as the 60-watt equivalent they say it is. I have the clamp light fixture shining towards a wall opposite the bed, so the effect is an indirect sunlight feeling.
i use the largest bulb--30 watt--for task lighting. The brightness of the 30 watt is supposed to be the equivalent of a 150 watt
incandescent, which i do not think is true. yet these are the best sunshine bulbs for regular fixtures that I have found.
https://sunshinesciences.com/
three of the sizes are presently for sale on amazon. the first three results on this search:
If purchased on amazon, they are easier to return if you are not pleased with the purchase.
https://www.amazon.com/s?k=Sunlight+Sciences&ref=bl_dp_s_web_0
There are also the Chromalux, LumiChrome and Ecolume bulbs and tubes in various styles with the best prices at Jerry's Artarama.
https://search.jerrysartarama.com/search?w=chromalux
One of the Ecolume cfl's is dimmable:
Ecolume Dimmable 23 Watt Spiral Bulb
V06995
https://www.jerrysartarama.com/ecolume-compact-fluorescent-bulbs
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When you find something you like, i'd suggest buying a few since the supply chains are so precarious. and these are much more affordable than a stinking 'light clock'.