I remember a test that Djozz did, where he silver plated the dome of an LED except for the frontal bit, thus making a Wavien Collar from the dome.
I.i.r.c. he gained some 20% of light in the right direction.
I thought it was a great idea, but never heard about it again.
So I had to look up what a Wavien Collar is. Wouldn’t you want as much light as possible to use the reflector so you get better focus? I was thinking of the opposite of a Wavien Collar. Something that covers the forward light and reflects it to the sides. Is there such a thing?
Yeah, so was i.
That’s not really possible because the light has to come from the focal point, and that’s where the LED is
Just put a mirrored cone right over the led. Suspend it on 2 thin arms.
My tweeters use something similar.
Just found this thread and I’m making my way through. I guess the purpose of this thread is for brainstorming, but it’s definitely kind of hard to keep up with as the topic bounces around from one light, to another light, to a lantern, lol.
Are the concepts fleshed out enough that it would be a good idea to post an official poll asking “which of these lights would you be most interested in for the next BLF project?”
If someone happens to be interested in discussing any particular project from this thread, they are welcome to start a new thread to discuss that project in more depth. Otherwise, I think this thread is serving its purpose, and a poll is probably unnecessary at the moment. Then again, if you want a poll to be started, you’re welcome to do that as well, I’m sure. 
yes no poll, a project comes when it comes
I was really set todo the Q16 but then the QT/ST came along
It is now waiting to see how Thorfire actually did before deciding on how to proceed.
The lantern is a long running DBSAR project an I have been feeling guilty about the Q8 taking lots of attention from it, so that is his thing, I just try to get it going.
The Q16 needs so much testing and behind the scenes there is talk about moving to a MCUs with more options, ideal for the Q16
Then all of a sudden Lumintop also made progress on the FW3a
So now I am not going to start a new thing.
It seems logical to work on the ST/QT soon, it is a clear defined project making a nice set with the Q8 and using a lot of the same parts, so it is clear what we want.
Tiny drivers, for Q4/Q2 and TKs mini 16340 light require a small MCU too.
So it all makes sense (well to me)
and the braindstorming is just awesome and who knows where it might lead to.
Ah and I am trying to get some sort of database for open Source CADs to use going, this would make it a lot easier for another team to kick off and make things that Lego with the rest.
QT π
Hahaha this MUST be printed on the driver silk for sure 
I have no idea if this makes sense, but how about a headlight with a strip lens?
Here, a rough sketch of 18350 light with 5-6 XP-sized LEDs and Khatod pl1629. Size roughly 35x40mm.
If you rotate the LEDs so they’re in front instead of above, a similar headlamp already exists:
It’s similar, but not really.
First, it’s 18650, so more bulky. For this reason it also needs a 2-strap headband adding to the bulk.
And it has only one white LED, which is less efficient. 6*XP-L2 V6 does 700 lm @ 200+ lm/W. Add a boost driver and such light doubles the sustained output of a 1-led + linear one.
Have you seen my contest light thread from last year? I made a light bar of sorts, using XP-E2 mounted on a board I designed myself. That board could be tweaked a little to make your desired project. I would actually love to see something like this made by a “real” manufacturer as it could be a really popular style if done right.
Interesting, thanks!
For the reference, here’s the thread:
As to the Q8-based thrower, here’s a nice idea for cost cuts from Astrolux. Though the light with 18350 tube looks so cute that I’d probably take it.
What about a headlamp with 2 LEDs driven at low current for efficiency that uses a 20700/21700 battery? More capacity than 18650 and more efficient led setup should result in pretty long runtimes with the lower modes en a very high (but short!) Turbo output possible.
Possible led choice would be sst40.
I’d rather have a lightweight 18350 based headlamp and bring a few spare batteries when the runtime is really needed. If you really depend on it, it even makes sense to bring two headlamps.
*I would love to have to have a lantern head that would work with the Q8-lego system. I made a diffuser out of a translucent bottle that works well with the Q8, but I am sure that a dedicated lantern head would be much better. USB charging and power bank function would be amazing. I wish that the Q8 had USB charging to make it easier to give them as gift’s to non-flashlight crazed family members.
*
Yes the BLF lantern of DBSAR ideally should be ready before summer 2018 right