I just watched a review of the Wurkkos FC12C with a buck driver, and I’m confused about one thing. Why is its brightness measured at only around 1200 lumens if the current draw from the battery is 5.9 A?
With that kind of current from the battery, the LED current should actually be higher, since a buck driver steps down voltage and increases current. But for some reason, the output doesn’t seem to reflect that.
Even if we assume the LED is getting the same 5.9 A, it should be producing something like 1700–1800 lumens.
Can anyone explain what’s going on here?
by Unique-Fact-8308
2 Comments
you need at least 8A so that the numbers are 1500+
Drivers like this take the Peak ‘impulse’ from a FET direct drive away. Think of it like a Turbo mode, which steps down.
Notice the huge runtime improvement. No “Free Lunch” here. While 5.9A might be available from the battery, the circuit limits its peak, prevents voltage sag, and other related factors to provide a long, even runtime.