You've got the wrong guy on this thread to argue with. I've been in Streamlight development labs hundreds of times over the last 10 years. Nobody designs their own leds, but they have tremendous pull with the led manufacturers. Their led testing is unbelievable! Beam uniformity and lumens are simply second to none.
They have shown me their side by side comparisons with nitecore (not pictures, hands on) and they're not in the same league. Not opinion, fact. There's a reason Streamlight is on every police officers gun in the field, fireman's lights, and ems tool box.
I'm not a collector, no dog in the fight here, but sit with their engineers for 10 minutes and I'll say I've never seen such pride in a product.
They'll source the best leds available every year, sort out the best of the batch and send about half back to the manufacturer to sell to nitecore
Just don't get a 2010 model... It's 2021 now. Somehow!
AA