>Provide pictures of the internals of their lights, i.e., pill/emitter shelf, MCPCB, switch, threads, driver etc. A drawing/rendering would suffice.
It really sucks to get what should be a good light and it has, say 10 emitters, and absolutely terrible heat syncing because the MCPCB sits on a small ledge. And that is if it is even sitting on the ledge ’cause it’s hard to tell if it really is ’cause the emitter board is screwed to the reflector. |(
100+
The worst case scenario that would happen if we at least be 20% of their total revenue
As a custom builder, we have done this since day one. When a customer wants a light & puts down a deposit we design the light, output a drawing of both, internal components and external design. They can add, change etc from there. We build the light.... When the customer picks up...or we ship a light, an as-built drawing is always included.
Most of the time, if we make a light for stock or just to sell, we do not furnish a drawing but images of all internal & external parts. It only makes sense.
BUT... for folks like Solar Force... Eagle Tac... the mass builders there can be problems keeping up with updates. The problem lies in the fact they have made 50,000 of X model lights. Now...they need to make a change in that design.... OOOPS! There are 48,000 lights in stock... SOMEWHERE... 15 countries... 80 dealers. SO... now if they put out a release of the update to the dealer...the dealer shows that update.... and you don't get what is shown. You are back to square one. This can be controlled to some degree through serial numbers... but dealers will screw that up in 5 minutes! 
I fully agree with your thinking but just pointing out how complicated it can get. We have considered mass production...we still are. This exact problem has been one of the things we have been trying to solve for a good while. Producing a good light is only PART of the business. As with most things, the devil is in the details.
Of course... You COULD only buy custom made lights!!! YES!!! Problem solved!!!! 
Can't blame me for trying! TL
Yes…excellent point, TL!
S/Ns, or it could have model revision numbers. Yeah…I know…I am aware that I may be asking a lot. But if I were a seller, I think I would try to get internal pics of the light a supplier was selling me. That way, if they cheat and ship something different, at least I would be able to nail them on it.
.... consult BLF first ...
What it takes is effort on the part of the mfg. and dealer. Certainly, 99.7867463% of the mfg. don't want to worry with it... and probably a higher number of dealers. We have 15 or so companies that IF we go mass production want to be dealers. But when you talk to them about anything like this... they want to run. 
Model number revisions cause packaging cost to rise... either from waste or new runs.
The best solution we have come up with is a combination of serial numbers, a place for customers to check components on those serial numbers, and somehow a dealer that will help. Here is one of our actual serial numbers.. 712-5660-1010-180-350-2AA-105 ... That tells everything from date to LED color and base size & lumens on a work light. It would be easy to add a code that would distinguish a change. It is a problem but CAN be solved (I think). Sadly, I doubt you ever see mass mfg. ever do it. TL