Protected flat top seem to be more popular 3+ years ago, but are not seen so much these days.
I donāt know if you can really call it a āflat topā since it has a wide, but short button top. They have to connect the strap to the top electrode somehow. If they did not add a cap of some sort the end would not be flat. So they use whatever cap they can. You end up seeing wide and narrow button top and with slightly different heights. It is all a mess with no real standards. 
It is trying to predict battery life based on calculations of voltage and load. This is very hard to do with accuracy. You can not expect good accuracy for predictions.
This stuff is very specific to the PB2. It has itās circuitry designed a certain way. Youād need to ask the Xtar people these specific questions.
Hard to say exactly what the efficiency is, but I would not think itās in the single digits of efficiency, but I really donāt know. Since the PB2 can output 5v from a single 4.2 volt battery it has to have a boost driver of some sort. Boost drivers do produce a loss in efficiency. Iām trying to decipher HKJās review and it looks like on battery power alone the efficiency starts at 90% and slowly drops to 85%. This sounds about right to me.
Also, remember that most batteries are rated for capacity by measuring all the way down to like 2.8 volt or less. The PB2 powerbank only puts out 5v from battery only until itās batteries are down to 3.2 volt. So if you are using two 2000mah batteries you will not get the full 4000mah out of them (assuming they are wired in series, maybe not, but you basically can think of it as 4000mah). How much capacity you actually get will be based on the discharge curve of the particular batteries you are using. Some drop like a rock after 3.2v and some keep going a long time after 3.2v. I would probably use the newest, best high capacity cells I could, like Samsung 35E or equivalent in order to get the most out of the powerbank.
Sorry I canāt answer too exactly, but hopefully it helps a little.
How come some of you guys buy/have the 2 or 3 of the same lights?
You gotta ax yourself, āWould I be happy if my oneānāonly got lost, stolen, broken, etc.?ā.
If not, you get a spare. Or two. Or three.
In the case of lights with different emitters, because they perform very differently but the owners probably like all the other aspects of those lights.
Other people get them in different colors, metals, etc. which I donāt get but that kind of ācollectorā mindset is common for lots of hobbies.
:+1: :+1: :+1:
For the ones that really matter
Will I be able to put a stb90 gen 2 in my convoy L6?
Is that the correct name? Search turns up nothing.
I think DB Custom was building a light with similar emitter, but I cant find it.
Transpo. 
SBT-90.
Why do we park on a driveway and drive on a parkway?
Okay, I was confusing it with CFT-90. That is the hard one to mod and is what DB Custom is using.
SBT-90 can be bought on 20mm star and is 3v so should be simple to put in L6, right?
So I bought a used Sofirn SF11
in the classifieds here. turns out the emitter came off its base, and rattling loose in the reflector.
Where would I find a replacement online: an emitter with base plate, please.
Looks like the previous owner used some phillip screws to secure the baseāwith a tilt.
Thanks in advance if you choose to reply.
You mean the led came off the metal disc? You can buy replacements if you can solder. Where are you located?
You can buy this for $6.50 plus shipping from MTN E.
You need to know the diameter to order the right one.
Afaict it only comes in CW, dunno if that takes it out of the running. :laughing:
Itās good up to 9A from what I quickly recall from the sheet, so hopefully it wouldnāt cook itself to death.
Soā¦ yeah, looks like it should work fine.
Am in Mass.
Donāt want to think of all the possibilities, which LED will the SF11
Take.
Itās a simple matter of desoldering the two leads, and resoldering the new
On once one get the proper LED. The person used two Phillip screws to anchor the Led plate.
The two screws are a bit lopsided. A hack job, I guessā¦.
And the LED became detachedā¦.
Would appreciate the part #, if someone is in the know.
TIA.
Mass is Massachusetts, USA? I would order from MTN. The SF11 comes with an XPL stock. You can choose your color, CW, NW, etcā¦ You just need to find the diameter, like 16mm, 22mm, etcā¦
The screws are probably factory, they are there to keep the MCPCB from rotating.
Yes, Taxachusetts.
Thanks for the info. Screws seem to be from the local hardware. Designed
For countersinking.
Turn of events is forcing me to delve deeper into the realm of flashaholic tinkering
Than I was prepared to do. LOL
But it is a shame to deep six an otherwise working light. 
While its entirely possible , likely even that other life exists out there, it is also equally possible we really are the only ones , so not naive sadly
I disagree. Once people understand just how vast space is, our nearest star is like 4 something light years away, and you factor in that Earth has only been transmitting signals about 100 years, you realize those signals have only reached a handful of nearby stars. Iām pretty sure life is out there, but they not only need to be within this super short distance to even know we exist, but also in this tiny sweet spot of time in their civilization where they are intelligent, but not nuked themselves back to the stone age yet. This might be a few 100 years within hundreds of millions of years. So if this super rare synchronization happens, they still need to have faster than light travel just to get here. So the odds of any two civilizations actually meeting are much, much lower than there being multiple civilizations out there. More than likely we would be the aliens finding ālifeā out there in the form of bacteria or maybe animals.
To sum it up, odds are quite good for life out there. There could be millions of planets with life and some of which are complex and maybe intelligent.
The odds of us or any of them coming into contact, almost non existant. The distances are just too far.
Star Trek is cool in that it looks like we could find other groups, but the reality is that even at just under Warp 10, about 6000 times the speed of light, the Enterprise would take years to travel the super long distances, even decades or centuries. This would not make good television, so they have to shorten the distances and times dramatically. We canāt even travel within a fraction of Warp 1, speed of light, much less many times faster. Practically speaking, weād need to go much, much faster than these Warp drives. Space is seriously way bigger than we can wrap our heads around. (All my opinion)
This is a fun thread. :partying_face:
And of course we got SETI ringing the dinner-bell for any hungry species out there, too.
āItās a cookbook! Itās a cookbook!ā