I tested the low voltage indicator and protection of the C8F 21700.
The side switch lights for 5seconds when turn on the light or made any press like mode switching.
It glows green when battery is above 3,4V.
It blinks red when battery is from 3,1V to 3,4V.
It blinks red fast when battery is under 3,1V.
The light shuts off at 2,6V.
The indicator also start to glow when battery draining to another indication level.
It climbs a little, but not the minutes it did before. Gets warm now too.
Double click it’s very apparent. Exactly like hid car headlights. Ramped to the top it wasn’t really noticeable before, but the meter just kept increasing. Like the was reading temp or something.
Battery is back on the charger. I’ll check it over time in the current configuration to see if it’s still climbing.
Got another of the same light inbound on the slow boat. It’ll be nice to compare the two. I grabbed this current light from Amazon. Way to go if you’re in the US. Three days.
Wow, your low output and slow climb is really strange.
Mine climbs up over maybe 2 or 3 seconds and hits 2600 lumen.
Did you measure the tail cap amp draw after the upgrades?
The last time I talked to Sofirn they said their tests showed about 3500 lumen.
I wonder if they are testing production lights or prototypes? Maybe they got some low quality FETs that’s really reducing output. It doesn’t seem likely the led wires are causing such a huge difference in output.
Anyway, it’s nice to see the stock driver (modded) can put out big numbers. You retain the battery indicator function.
Regarding the climb, I wonder if the stock FET has a high turn on voltage. This would explain the low output. Then the high channel resistance would cause the FET to get hot, and I believe this causes the channel resistance to go down which would increase the output.
Hey guys, sorry that C8F 21700 version has this issue. I was told it’s caused by MOS component. I don’t know what MOS is but I would love to send new driver to whose C8F max output lower than 3000 Lumens via 21700 battery.
Please PM me.
I just contact Cissy of Sofirn and she told me to send a new driver :+1: Never disappoint with Sofirn service and fast respond ,looking forward for new Sofirn light
I want to purchase a C8F 21700 from Aliexpress but am now concerned about this defective driver issue.
Can you advise if their stock is being checked/replaced/fixed ?