intl-outdoor has XHP50 6V~12V...What does User Configurable mean? I want the 6V option to drive off 2 x 26650's via DD.

Flashlight Modding and DIY Parts
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Seems to handle substantial current pretty well:

(rest of his post here: Cree XHP70 up to 4022 Lumens and XHP50 up to 2546 lumens - Multi-die leds. and it’s a great read)