Maybe I misunderstood, but your original post said: ...'Is artificial light interfering with their photoperiod, maybe?'...So my answer was directly to that statement. I understood it as you were suggesting the artificial light is not suitable. It may not make sense and matter to others, but reason I reversed days and nights was mainly to consume less energy/pay less for hydro. I had a big light set up for all plants I have (succulents and non-succulents, approx. 300 pots) and on top of it there was electric heating only. I did not have enough of window space for them (very small windows + 18 huge evergreens that were abt. 70' tall surrounding the house all around). Plants have to be indoors for about 6mo (even bit longer) in my zone, that is a long time. For me, that was a big benefit. Yes, there are plants that need long or short night to flower (=obligate photoperiodic plants); there are also day-neutral plants....and so on. In spite of reversed photoperiod, the plants grew and bloomed well. I did not eliminate the night - time to rest :). They were also kept in cooler temps, just below 50*F. I have posted about it quite a bit in the past, and I am not advocating for anyone to do the same...

Also same variety, sedeveria or graptosedum....compare to 'California sunset' I have several that i don't know the name of because sometimes they get mislabeled...a lot. Luckily, care of all 3 are exactly the same.

I suspect the planter has no drainage holes judging by its placement on the wire rack? To allow any plant to thrive, succulent or not, it must allow for drainage. Also, what kind of mix are they planted in, it looks very dark and peaty? Gill

1. PVN:) a really nice one too. 2. I have this same plant. It's a Pachyphytum. Your plant's leaves look a little more rounded at the tips, but they pretty much look exactly alike:). When I first bought it it was more purple. Stayed purple for a few months. Now it's green like yours. Hablu gave me a link to an id. Here's the Link. 3. Kalenchoe blossfeldiana I'm pretty sure. When it blooms you will definitely know:). I would bet it's K. blossfeldiana tho. Here it is now. I left it out and it burned a little so I've put it in less light. I'm sure that's why it's green. I just switched it to better mix too:).