I built a couple triples last year. The first was a Roche F12 with a body tube cut down to 1x18350, powered by a 5 amp driver and equipped with three XPG2 neutral 5000k emitters on a 20mm Noctigon star. I also modded a Sipik 58 to run on one IMR 14500 powering a triple Nichia 219 high CRI.
This week my modded Convoy S6 should arrive. It's got a 5.6 amp driver powering triple XPG2 on a Noctigon direct copper star. This one has 1 cool white, 1 warm white and 1 neutral white emitter, with the overall tint blending together into a nice neutral.
I don't yet own any larger triples. Perhaps this will be the year I purchase a multi-18650 light with triple XML2s....