[PART 1] Official BLF GT Group Buy thread. Group buy officially closed! Lights shipping.

Will update list later
Yes I contacted them via theri website and got a standard “thank you for showing interest in our software blabla please contact us at X@X.com” reply
So I send an email to the address asking the same, no reply yet

Aren’t the carriers going to be in-series in the tube though?

I am most likely too late or way off base to mention this, but what about a battery tube that can house 2 rows of 4 cells?
Line up 4 in series on one side in a battery slot, and if you want to run 8, line up 4 more down the other battery slot.

All of course housed within the battery tube still exactly how it looks from the outside, in the GT renderings.

Just because the carrier are physically stacked on top of each other doesn’t mean they are electrically connected in series :wink:

With the way I have it planned out each carrier will be it’s own 4S “battery” (which is what it technically is) and they will be electrically connected in parallel, giving you 4S2P. If you leave one empty, it will simply be 4s1p

The carries are “stacked” on behind the other but with two contacts on each end (or three if they end up putting a tail switch) the voltages will add up in parallel, see this post here: [PART 1] Official BLF GT Group Buy thread. Group buy officially closed! Lights shipping. - #750 by Enderman

Each carrier is 4s1p, stacking carriers increases the p, not s :slight_smile:

That is the way Fenix has been doing it, except 2S2P, with stacked carriers.

I’m interested depending on the price.

4s li-ion, so, the driver will be in buck or boost config? or just a Fet direct drive one
if using 4s and xhp35, i prefer the DD driver, simple but high efficiency

We are not sure what the driver will be at this point, something FET based though as a buck driver would raise the price a quite a bit.

For reference, the BOSS1 Reflector dimensions:

O.D. 89.8 mm

I.D. 85.0 mm

Depth 58.0 mm

Overall I'd say the quality is very good - no noticeable rings or horizontal marks in the finish as you can see in some reflectors, 2 minor marks/imperfections, big flat surface on the bottom. it's a lot like an over sized HD2010 reflector. The flat bottom on the underside is about 33.5 mm - too big for any stock MCPCB to clear the wire connections, but lots of room to add flat copper extensions outward, so might just do that with using a 20 mm MCPCB, which the recessed cutout in the shelf is made for.

I’m in (depending on final price point).

That makes sense. I wondered how that was going to work, cheers !!

This is actually a clever idea, the carriers could either be keyed so they only go in one way or you could have the 2 carriers each be 2 cells long and half circles. Load one set of 4 batteries in or load 2 sets. It wouldn’t offset the balance as well, but it would simplify the installation of the cells as you wouldn’t have to keep track of which side of the carrier you insert them into.

Good idea, and put the switch direct in opposite position for good balance. Weight in the bottom in horizontal position and switch on top.

Either way you would still need to have custom battery holders made…. in which case you should just make them parallel anyway.
Being able to put all 4 at the back is why people want a double long tube in the first place, for balance.

Possibly wouldn’t even need carriers. Bore the battery tube with 2x ~26.5mm wide openings side-by-side. Have a rotating tailcap (Olight x7 style) so the springs stay in the correct place.

Not sure if I’m right but running 4 would be 4s1p,
running 8 you’d have 4s2p???

If you look at the weight of the head you are probably right. With the 3D CAD program it’s possible to calculate the weights of the pieces. The battery weight of one 18650 is between 44 and 48 gram.

That sounds overly complicated for a budget light…
The tube would also need to start as a solid chunk of aluminum rather than just an aluminum tube which is cheaper and easier to finish.
Also, added weight.

Dunno about complicated as such, but yeah I agree on the aluminium thing. It’d take a huge chunk to make each one - but think Courui D01 - they must have been chunks bored out. And their price point isn’t premium

Being able to put all 4 at the back is why people want a double long tube in the first place, for balance.

What people? Need to get the facts straight, this was never voted on or polled - but dictated to us BLF member’s.

Or am I wrong?

100% right. I was almost going to say exactly what you said.