Convoy S21D w/ legendary Nichia 219b. Review & comparison w/ Nichia 519a, B35AM, FFL351A ROSY & other "tint-snob" LEDs. (Summary & measurements on P. 1) LATEST 👍: Firefly E07X with VERY rosy 351A LED and Lume1 Driver.

LED Flashlights – General Info 21700 Flashlights
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Not sure the 3 and 8 degrees will work with your 4x219b since they both have a big protrusion in the middle. Maybe 219b domes are not tall enough to cause interference.

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