Xmods: Beamtech BT-4000 - From Triple XM-L to Aspheric Thrower (beamshots)

Flashlight Modding and DIY Parts
1

I received a defunct Beamtech BT-4000 from a member here, and rather than fixing up the single-cell-powered-triple, a change was in order.

Since the drop-in design had a marginal thermal path, it would have required quite a bit of re-engineering to make it work - and I would still have had an underpowered triple.

Aspheric thrower? Yes, please.

Stock light:

Drop-in:

I reached into the bag-o-lenses, and this one came out:

It was just a bit large for the existing head, so a bit of machining was required. I opened up the head and inside of the bezel ring to allow for fitment:

There was a ding in the head, so it was also turned down on the lathe. it makes for a nice 'racing stripe.'

The lens now fits nicely, and the bezel ring screws down fully:

Next up, the pill.

2

The new pill needed to have a better thermal path, so that means moving to a screw-in design.

Here's the billet:

After a bit of turning, facing, drilling and threading, this popped out:

Here's the bottom, with the driver recess:

Top, with centering lip for the LED:

Here's the pill, threaded into the body:

Underside:

Semi-assembled:

Where does the body end and the pill begin?

Staring at the business end:

Next comes the wiring and beamshots.

Stay tuned.

3

Are you going single LED? With a huge great chunk of metal for heatsinking I presume.

4

Man thing looks awesome! Love the bubble lenses :bigsmile:

I want one that big (jealous)

5

Great stuff, brother! Looking forward to seeing the final results.

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Updates in second post

7

Looks awesome!! Nice machine-work Chicago! I am definitely staying posted for updates. Can’t wait to see the results!

8

Nice lathe work CX.

Awesome , in fact .

9

:slight_smile:

10

Love your work Chicago X. I have some parts in the mail to you that need threading.

11

Is that anything like a "Rogering?"

Thanks for the kind words, guys. This one should be quite the thrower.

12

Great work. The modification looks awesome !

13

Ya, I obviously know a good thread job screwing into a nice body when I see it. :open_mouth:

14

S 'bout time you got back to modding!

I've been bored to death waiting.Wink

Are you going for dedicated thrower, or will there be adjustment for flood to throw?

Nice work X.

15

Cool, can’t wait for beam shots, good to see the new lathes not gathering dust. :bigsmile: now I really can’t wait to see more from house chix

16

There is a little bit of focus adjustment possible, but nothing even close to a FTT light.

I plan on playing with the focus a bit to see if lux readings change dramatically from the projected die image to slightly defocused.

17

Can’t wait for beam shots!

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Subscribing. Like others already said, it's great to see that lathe put into service!!

19

I made a copper press-fit ring to hold the driver, as solder doesn't stick to aluminum very well.

All buttoned up. Here are a couple of quickie beamshots:

25 meters to the shed.

Sky shot:

It appears to be a bit brighter than my Crelant aspheric. I'll get some lux and lumen measurements tomorrow.

20

Very impressive! Looking forward to lux and lumen ratings.