I grew them for years with straight bagged potting soil and they did
OK as long as they aren't overwatered. However, after mixing the bagged
soil 1:1:1 with perlite and granite grit, they have done SO much
better. They like good drainage and aeration.

As far as lighting,
I can't say much that's specific for amaryllis. I grow mine indoors
during the winter, with only window lighting, and they get floppy. As
soon as it warms up I put them outside with full sun most of the day and
they explode with sturdy growth. A 6500K fluorescent bulb should do
fine for amaryllis.

Thank you both so much!

Good to know what you are using, and what works for you. I do have a couple extra fluorescent bulbs (6500K) that I can try.

So I have the bulb newly potted in coir, grit, and perlite (roughly 1:1:1). All I have to do now, is wait!

Also, another question has come to mind: What should I do about fertilizer? I come from growing cacti and succulents, and you don't really need fertilizer there, so pretty much zero fertilizer experience.

Thanks!

EDIT: The 'coir' actually isn't 100% coir, but those tablets of compressed peat.

They are heavy feeders once the leaves start growing. I don't feed mine at all in the winter, except what is left over in the pot. During the summer I add Osmocote (Flower and Vegetable formula because it's balanced) twice, at the recommended rate- once when I put them outside in May and then again in August or September. I bring them in in late October.

Just as an FYI, there is an FAQ stuck at the top of the main page. It's years of info from lots of expert breeders, growers and hobbiest. Take a look!!

Yeah, I did actually take a look at that, and got some good tips and advice. Thanks! Now I know I went to the right place :)