Involvement:Expert (understands the inner workings) - Ownership:more than 1 month
I'm using this driver to drive a CREE XR-E P4. The driver looks well made and pretty compact. 17mm is about the right size for most 16340/18650 based flashlights. Driver works with either 1x18650 battery or 2x14340 batteries. With 2 batteries the led is brighter but generates more heat. with one battery the LED says cool but is a bit dimmer. I have also tried this driver with a XP-E R5. This works fine with two batteries but with one battery the medium mode flikers randomly ones the battery drops to 3.7v.
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