Convoy C8+ SST40 Runtime

Hi everyone! Recently I bought my first flashlight that cost more than $10, and of course I immediately started exploring it.

Since I ordered it from a local store, there was only one configuration available: a 12-group linear driver. After looking around online a bit, I noticed that for this specific configuration with the SST40 emitter there weren’t any runtime or brightness graphs available, so I decided to make one myself!

Please don’t judge too harshly, guys — this is my first experience with flashlights.

So, the blue curve represents a Samsung 18650 30Q battery, and the green curve is a cheap low-current battery with an internal resistance of 31.5 mΩ. Some people might find it strange that the low-current battery maintains turbo mode longer than the high-drain one. I thought about this for a bit and came to the conclusion that it’s likely a characteristic of the linear driver: the battery voltage sags under load more slowly, which means less current is wasted as heat, allowing the flashlight to sustain maximum output for a longer time.

Thanks everyone!