Sofirn IF25a Flashlight: Turbo tests Samsung 40T, Sofirn 4000 and 5000mAh

In this video, I test out three different 21700 cells (Samsung 40T, Sofirn 4000/5000mAh) in my Sofirn IF25a to see if any of them produce more lumens. Paid link - I may earn a small commission at no extra cost to you: Some reviews find that using a high drain cell like a 30T/40T can increase the lumen count up to 4200+ lumens in the IF25a. I used a simple lux app on my phone and the ceiling bounce test. Test results: no significant difference in brightness. I wonder if the cell included with the IF25a is already a high drain one (Lishen LR2170LA). I don&have any way of measuring the total lumen output of the light but it&apparent through lux readings that the output across all three cells was similar. What do you guys think? Am I missing anything? Let me know in the comments below.