I tested my SP40 with a Keepower 1200mah 18350.
I got around 6 hours on medium before the battery was drained.
Idk how consistent the output actually was. But to my eyeballs there was never a step down.
This wasn’t a highly scientific test and I only checked medium mode. I was curious because i was about to take the light on a trip. I was only after a general idea of runtime.
Buy directly from sofirnlight.com is a another choice for customers. You are protected by platform where you purchased from. But on sofirnlight.com you are also protected by PayPal if anything wrong happen. Most importantly, most orders on sofirnlight.com will be from sofirn fans. I don’t think sofirn will ruin the reputation among fans.
So, I think it the same to buy on sofirnlight.com and other platforms. You can choose which one you like.
Fans know that sofirn offer good products at great prices which means the profits rate is low.
sofirnlight.com will offer almost the same price as on aliexpress, but will send some discounted codes regularly which will be started in 2020.