My primary grow light is (5) Vero 29 BXRC-35E10K0-C-73-SE (68Vf, 3500K), approximately 9.5" OC, being driven by a ZPE PF-P400CC-C105-S-DM (400W, 1050mA) (about 340W of 3500K for a 2x4 tent).
I have at my disposal (10) Vero 13 BXRC-40E2000-C-73-SE (34Vf, 4000K), and an Excelsys LXD150-0450SW...