Looks like a big pot for that plant. Did you re-pot it also in that pot? What size pot is it in?

Ah ha! Point taken. I'm trying to find a source for small square plastics, or shallow clay pots. That is a 6.75 azalea pot. Too much moisture? I will downsize to a 4.75 azalea pot and have the stuff for Al's gritty mix to screen this weekend. I did repot in that one, since my shipment was bareroot.

The soil you used looks to lean may want to sift it more and add add more soilid pourus material such as pumice or sifted gravel etc. Slight chance it's over pottted but as it's usuall to grow it in something smaller ( 4 inch) for 2-3 years sometimes even longer.
Observing the dark top area and wrinkiling effect on the side(s) doesn't indicate that it's to bright but it could be the combined bulb wattage is: To hot, to close or to long. If any lighting concerns are possible it could be as easy as the total wattage from the light is to close.
This is said only as opinion though as mine is on a window level shelf with natural sunlight and some added lighting during the evenings

I'd guess too hot and it got a little burnt. Most of it's fine though. I fried part of my Echinocactus with a light but most of it's still fine.

Will it adjust on its own or should I move it out?

Warning: They leak a white color sap that is also toxic.

You may want to cut the darker burnt area on top at a sharp angle in both drections then mist the area you cut to slow the sap flow down

I don't keep this one under lighting during winter, for any extended periods of time, that being said there is no doubt from me, if mine I would move it a few inches lower ( at least 6 inches lower) to prevent the sharp cut(s) from burning again. Tip slow fequent but light misting misting the cut area sap flow( to a stop) will help speed up the harding time.

if you continue to see new wrinkles develope it's to hot under your light exposure to help cool all your plants with out sacfrificing any of the brightness, as suggested previously move some air.

I have been searching for a mail order source for this euphorbia. I only need the cutting. If anyone can tell me a source, or wants to sell me a cutting or a plant please let me know. I can't afford the ones on eBay.