Could you tell diameter of front glass and green o-ring? I guess black o-ring is better (green o-ring spoils colors of light).
I’d got 219B 5700K, and it’s very pleasant color, but I guess green ring gives bad color tint. Now I wait another driver (Convoy 1400mA) for replace. Bad for AA NiMH 
but no PWM.
I bought cheapest version here: http://ali.pub/3cbiah - there is aluminuim pill, spacer between switch and tailcap made of aliminium, and different nuts (in head and in tail), no thermopaste. It’s little unconvenient for dissamble. I was planning to upgrade this flashlight, so I think it’s good option.