As a few others have mentioned a well designed, slim & rugged AA/14500 light focused on EDC would be wonderful. A light where the clip & ergos get as much attention as the emitter.
I would also like to see a modern take on the emergency beacon/signal light. Something that fall into roughly the same form factor as the lowly chemlight. Multiple colored emitters, possibly including IR. Indestructible (ish).
^ Sounds perfect to me! AA/14500 is hard to beat for its balance between battery life, potential power/output, and form factor.
I also like the idea of a BLF Special Edition keychain light. We already made the biggest flashlight in the world, now let’s make the small(est) one! 
I voted for a BLF headlamp, but what I would really like to see is something completely different.
A BODYlamp…
Multiple led (high CRI)
Puck light with aluminum heatsink around the circumference (2” diameter?)
TIR optic
Able to be worn on a strap/backpack harness/belt/maybe across the chest, (think Iron Man)…
Separate wired battery pack for extended run time.
Too far out?
I’d love to see an EDC zoomie.
IAW: Something useful. We can really only have one? 
Another headlamp … :weary:
I’d like to see a 5A single AA (Eneloop only, no 14500 Li-ion support) flashlight, aluminum host, black ano., diamond knurling, tailstanding forward tail clicky with rubber boot, 1-inch diameter female head with plain bezel (no crenellations or scallops), 3 modes, 5Lm, 50Lm, 500Lm, polarity protected current regulated constant current driver with low voltage protection (constant brightness, no PWM, no step down, cuts out at 1.05V), copper bonded high CRI 3500K emitter below the BBL with no cast of any kind (sandy), borosilicate glass lens, aluminum silvered reflector, potted electronics, screwed on deep carry clip, waterproof, and a bag of Cheetoh’s.
It’s worth repeating this once in a while:
If you want something which doesn’t exist… make it. Nobody else is going to do it for you.
What about designing and fabricating the longest sustainable running flashlight on the market. We have the thrower category and the flooder and the highest lumen torches. The longest running torch I own is the original GT, it seems to run all night long when the family’s out playing at night. It gets warm but holds turbo like nothing else I own. I am no engineer but don’t think it would be that difficult to achieve. What about adding twice the mass to the FT03 for example and limiting it to 1.5K lumens. Poor example I’m sure but something along those lines. I love my FW21 Pro, NSX3A and other hotrod torches but getting a bit tired of the super duper lights not being able to even run on high for long periods of time. What does everyone else think? Am I just dreaming or is the technology still not there.
Take a look at Anduril 2, much better
I think a good headlamp would be something different
I agree, a compact light that could support continuous 1,500+ lumens would be great.
This is mainly about the physical size and mass of the light. It may or may not be possible, depending on the definition of “compact”.
There are lights which can already do it… Q8, SP36, D18, M43, MF01S, and almost anything with a similar design.
The laws of physics are a bitch! I’m sure a very solidly built 18650/21700 tube light could manage 1000lm sustained.
How about the 30mm wide single 21700 Thrunite T2?
ZeroAir’s review shows it can sustain 1600lm for an hour or 1400lm for 90 minutes.
I fear we may have hit a wall in terms of emitter and lighting technology. I honestly do not see anything on the horizon, which actually has me excited about it. Until companies can come out with the next breakthrough in emitter tech, I really do not think there is much to build interest on upon. But, if I had a choice I would try and make an attempt at making a 10 million plus candela light. If possible, maybe a sustain 100,000 thousand lumen? Of course, it would have to be a thrower. Just throwing ideas out there.
Hey, a reflector this big might be the largest in the flashlight…but obviously to have one that is the largest ever we should top that.
That one looks to be the right size, lol. Whatever it takes to make it happen I say. But, as you mentioned, shipping will most likely kill the deal.
You don’t ship the light to yourself but ship yourself to the light. It may not be cheap but come on, can it be so bad?
I would greatly anticipate anything, which is a multi-emitter E21A setup. (I mean multi as at least 12, but the more, the better.)
There is already Astrolux MF01S and Emisar D18 - these could be good as a starting point, but power should be capped at about 2.5 Watts / emitter. I think, we wouldn’t want to make the precious E21A emitters aging too fast. This would mean 45 Watts for the mentioned flashlights. As tint selection, I think, only these should be sufficient: 3500K, 4500K, 5700K.
Also, there is already BLF LT1… think about a tint mixing between 2000K and 3500K with E21A, that would make a super moody lantern! (A variant with tint mixing between 2700K and 4500K could be also very good, but the first one would be irresistible)