[Available again! - BLF special edition light] new Sofirn AAA twisty high CRI 5mm LED

With that resistor mod, how long does the light stay above the stock output Djozz? I assume it is still a battery vampire?

I should start with a fresh battery, but the light has been used for around 8 minutes now and I’m at 21 lumen. I will keep it on and see what we’ve got in an hour or so.

Edit:
–8 min 25 lumen
0 hrs 21 lumen
1 hrs 15 lumen
2.5 hrs 12.5 lumen
4 hrs 9.5 lumen

Yeah, that’s what I was up to :+1: .

I find the tint of the EX version nicer than both the other version and the ww Yuji. The spot is uneven, but that doesn’t really matter to me.

Think that might help the red C01 as well?

I doubt that (but I do not have one to check), the bad beam of the red C01 seems to me not caused by the reflector. I think it is because the light emitting area of the red led is much smaller than a white led because it has no wide phosfor layer. And small light sources need carefully manufactured optics to make a good beam, the top surface of a cheap chinese 5mm led is likely far from optical quality, or even 5mm Nichia leds.

Thanks djozz, I might try it tomorrow before I Scotch-Brite the led. Just to see if it helps.

Djozz, thanks for this, this will be a great little backup light for hiking, starts high and keeps it pretty good for 4-6 hours, that is what I was looking for. Much appreciated.

Measured up to 7.5 hours now, time to go to bed. Will have another look tomorrow if there is still light, I assume that just as the unmodded C01 it will drain the battery to completely empty. The runtime chart sofar:

Hmm…no regulation without a sense resistor to regulate. I guess I should have seen that coming.

I assume with something in between, like a 10 ohm resistor, we’d see in the ballpark of 12-14 lumens steady for maybe 2 hours or so, then the long decline.

Another datapoint, 14 hrs / 0.6 lumen.

Yes, no regulation, I already noticed that without resistor it does not light, it is simply is series with the led somewhere I guess (before or after boosting?, no idea how that works really).
I’m not fanatic in constant output, a steady decline is useful, like the incan days, there is not so much that demands steady brightness and a slowly fading light does not leave you with surprises.

I had ruined one black C01 while finding out about the potting. So it was spare for some fun. :slight_smile: (did this to a sk68 too a couple of years ago)

LOL it`s even cut one of the Vias in half! :smiley:

That is one awesome pic! :+1:

Well done. You can’t deny the potting crew did a good job on that one.
BTW I downloaded a copy of the SK68 picture for “recreational use”, I can’t help smiling. :+1:

Yes, that one was the best ever because of the irregularities and moving parts in the design :slight_smile:

Looks like you could shorten the light by trimming/sanding the head and “reflector” shorter too.

Great pics and RIP C01 used for testing…

All hail the “in the name of flashlight science” !!! :beer:
Thanks djozz, that’s an awesome photo and cut!!!

Neat, a physical cross-section of a light is way cooler than any CAD diagram!

Two more datapoints: 14hrs 0.6lumen, 24hrs 0.1lumen. I call this test a day :slight_smile: Battery voltage is 0.57V now.