"TINT-SNOB LIGHTS": Convoy S21D & M21H w/ legendary Nichia 219b. Versus: Firefly Rosy FFL351A, Nichia 519a, B35AM, etc. (Summary p1) LATEST: DA1K w/ beautiful Rosy 👍 NTG50 4200k & Lume X1 (Test: Duv -0.0095, 2700 lm !)

LED Flashlights – General Info 21700 Flashlights
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Well, in that case you’d want a weighted harmonic mean. Found an online calculator: Online Weighted Harmonic Mean Calculator

Lets throw out an example and use 2700/5700 with 2700 at weight 1 and 5700 at weight 1.3 (i.e. 30% more output than 2700)

Weighted harmonic mean = 3843K