Well, they can be called toast if things go awry, but the people that make them call them optics… this is because they are computer designed to align the transmittance of the lights rays, guiding the egress of photons to a predetermined focus… hence, optics through reflective manipulation.
What do you mean? The way I understood it, the driver has eight 7135 regulators in total – there is only limited space available on the PCB so six of those are located at the bottom (spring side) of the double-sided PCB. Where else would you put them?
They don’t actually dissipate all that much power – when all eight are 100% on, I’d assume the driver dissipating around 2.5 W total (worst case) when the battery is at 4.2 V.
What is probably meant is that the 7135 chips are orientated 90 degrees different from usual, what makes the thermal pads not facing the ground ring anymore and thus the heat has a worse path to the flashlight body.
Those 7135 chips are pretty tough though and I expect that they can handle this.