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.
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.
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.
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.
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.