Vf plays a role there. LHP531 has much lower Vf and output varies a lot depending on the battery:
https://www.reddit.com/r/ConvoyFlashlights/comments/1qbrf2d/comment/nzcmh5m/
1645lm on Samsung 50S2 and over 2400lm on Reliance RS50.
3 Thanks
Yes I figured as much from the curve below. But there is something else about this S21E review that I don’t understand. Did I miss something?
Looking at the graph below, does this mean at Vf=4.2, current draw of 519a is 6A? No matter what battery you use, the draw is 6A?
Maybe not exactly 6A because even high drain batteries will have some (small but some) voltage sag so you’ll see 6A at startup and then it’s going to fall off the cliff.
Then I checked koef’s review of 519a and see the graph below. Forward current is 6a at Vf ~3.3v, and should be much higher and/or LED gets destroyed at 4.2v no? Did I understand this correctly at all or should I go back to my day job?
PS Caveat: I couldn’t find the CCT of the LED in the @bilakos10 's review.
There’s always some Vdrop on the driver, emitter Vf also varies and on top of that maybe Simon figured out how to put some sort of a cap on a FET driver?
This assumes a super low resistance build and battery.
Considering the Convoy S21E light or driver isn’t built like a Nightwatch A54U2, it’ll be fine.
Of course, if you decide to bypass the springs, use a super low IR cell and even thicken the LED wires, that might change.
Now that I’ve looked MORE carefully lol and searched the review, it’s SST-40 LED he was testing. False “alarm” - I ASS-U-ME it was 519a.
I don’t get it. Is it the same driver?
Yes, that’s why I don’t get it either especially because Samsung has pretty high CDR as well. Not my thread though, I just reposted it.
The Reliance RS50 is a much stronger cell than the Samsung 50S in all aspects. Higher power density, lower IR and much better cycle life.
On a FET driver, you will see big differences.
7 Thanks
But that’s on a completely different light, different driver. In the M21K, as long as the voltage sag doesn’t drop below Vf at given current, the output should be the same.
3 Thanks
Yup, half of this thread is off topic.
6 Thanks
I’m pretty sure that @thefreeman knows what he’s talking about. Which brings an interesting question: does the 20 A regulated momentary turbo have a thermal step down, if needed?
Lol
I belong to forums where off-topic posts are discouraged.
Some moderators get bent out of shape over anything off-topic, and when that happens, I think of BLF, and how chill it is here.
5 Thanks
Unless I’ve missed it, the driver doesn’t appear to be available separately, does anyone happen to know the dimensions? I have a short L6 looking for an upgrade.
It’s 28mm, also Simon doesn’t list all the parts he can sell.
6 Thanks
Ah, I had hoped for an exact match, if I remember correctly the L6 uses 30mm, this might just work!
I wonder if I can modify a couple of the 20 to 22mm Kaidomain driver adapters to make it fit…
I’ll message Simon asking if he’d be willing to sell the driver separately.
What is this next to diodes? 3th coil?