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

[cannga]

@stephenk

@nicodimus22

Out of curiosity, what does this mean in layman’s terms? I already have the 12A version, so I’m wondering what changes if you get the 8A. Differences in output or runtime?

The 8A version is more efficient, and is this likely to result in higher sustained brightness, and longer, but not quite as bright turbo.
I’ve just ordered the 8A CC 60 degree 519A 5700k version.

A couple months ago we had the above exchange - the question was about behavior of 8A Buck versus 12A FET, the 2 versions of Convoy S21D. Thanks to @bilakos10’s review of the FET 12A HERE, we now have an approximate answer, and it looks like stephenk hit it on the nose. :+1:

The 12A FET driver indeed has a brighter max start ~2800 lm, but then stepdowns quickly and rather drastically, to 350 lm, 12% of max after just 2 minutes.

The yellow letter X superimposed on bilakos10’s 12A FET graph represent numbers from the 8A Buck version of the light. They are approximate ceiling bounce numbers, where I assumed 100% is 2000 lumens. Even though the 8A Buck is not as bright at start, it has a much more gradual and gentle stepdown. In addition, it sustains brightness much better, settling in at ~750 lm.