There has been long winding discussions regarding led choice in TK’s main D4 thread.
One thing to consider is heat. The Nichias do get hot VERY quickly. The XPLs are noticeably brighter for a little less heat - i think, but for a 45% premium. The XPGs are somewhat a middle ground as i understand (i don’t have that one). You’ll want a couple anyway… especially now that 90 CRI 219c are available. Although not exactly budget this light is irresistible. 