I recently acquired a Sofirn C8F flashlight that runs off a 21700 battery, or a 18650 battery using the included sleeve.
Then I purchased a Samsung 50E 5000mAh 21700 battery as a backup for it. I knew that the 50E may not have the current capability of the included Sofirn 4000mAh battery at the turbo level but I was OK with that since I don't use the turbo level that often. Besides the next level down is just fine for me and I assumed that I'd be able to hit that no problem with the 50E.
So after getting the 50E in the mail today, I proceeded to charge it up along with the Sofirn battery so that I could test its performance. One after the other I tried both batteries in this flashlight and noted the Lux reading in my makeshift lightbox. Naturally, I expected to see a slightly lower reading with the 50E at the turbo level…………..which I did. And I expected to see the same output at the lower levels regardless of what battery was installed………….
But instead what I saw was a lower level with the 50E battery at all levels. At the low level (not the moon mode…..just level one), I'm getting 410 lux in my light box (about 7 lumens) with the 50E. And I'm getting 660 lux (about 11.8 lumens) with the Sofirn battery. It's a proportional difference like that at all levels.
So I'm wondering why that is? Evidently this light is not current regulated? I guess I can be OK with it as long as I get proportionally longer run time with the 50E compared to the Sofirn battery. What type of driver design would cause the output to be proportionally different at all levels with one battery vs another? :thinking:
Then I purchased a Samsung 50E 5000mAh 21700 battery as a backup for it. I knew that the 50E may not have the current capability of the included Sofirn 4000mAh battery at the turbo level but I was OK with that since I don't use the turbo level that often. Besides the next level down is just fine for me and I assumed that I'd be able to hit that no problem with the 50E.
So after getting the 50E in the mail today, I proceeded to charge it up along with the Sofirn battery so that I could test its performance. One after the other I tried both batteries in this flashlight and noted the Lux reading in my makeshift lightbox. Naturally, I expected to see a slightly lower reading with the 50E at the turbo level…………..which I did. And I expected to see the same output at the lower levels regardless of what battery was installed………….
But instead what I saw was a lower level with the 50E battery at all levels. At the low level (not the moon mode…..just level one), I'm getting 410 lux in my light box (about 7 lumens) with the 50E. And I'm getting 660 lux (about 11.8 lumens) with the Sofirn battery. It's a proportional difference like that at all levels.
So I'm wondering why that is? Evidently this light is not current regulated? I guess I can be OK with it as long as I get proportionally longer run time with the 50E compared to the Sofirn battery. What type of driver design would cause the output to be proportionally different at all levels with one battery vs another? :thinking: