Large Indoor Cactus Under Lights: Needs 15+ Hours Grow Lights, Not Window Light

3-Ft, 20-Year Cactus on Shelf with Mirrors, West Windows Under Carport—Enough Light?

Owner wants to keep it visible, asks if feasible under lights.

Cacti Are Poor Houseplants Without Intense Light

Greg: only success with grow lights ≥15 hrs/day. Proposed spot likely insufficient; plant will stretch and lose appearance. Backup south window upstairs better.