Harry makes some very good comments. While I am not absolutely positive of what I am about to contribute, I believe, with all the reordering of plants, this is true. Echeveria agavoides 'Red Edge' and 'Lipstick' have now all been grouped under Echeveria agavoides 'Corduroy'. The sun certainly will color up just about any Echeveria, including E. agavoides of any species. In my picture, I can't absolutely say mine are named correctly other than the three in the front. Anyway, just hoping this clarifies things a bit. There are some many hybrids and cultivars E. agavoides as well as other Echeveria, it can be an undaunting task to make a positive identification. So just enjoy their beauty no matter what they are called. Then, there is this Echeveria agavoides variation that really colors nicely with sunlight.

UPDATE: Here are some pictures: You can clearly see by these pictures, that all the growth points have enlarged. Here is the before picture: Excited to see what will happen. Hoping for flowers. There are also side growths like you can see in the first picture. What puzzles me is that there are about three of these growing out of base, under the leaves. It was very hard to catch a good picture, but I will make do with what I have: You can see it in there, but the is a shriveled leaf curled upward, and blocking it. There are two more of these, but they are pointed straight down into the soil. ~palmsandsnow

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...

Does the pot have a hole in the bottom? If not, a pot with that drainage would be best. Is the second picture the plant now? you could repot in the fast draining mix recommended on this forum: commercial cactus and succulent mix combined 50-50 with perlite or pumice. Make sure your plant gets the proper amount of light.