[MOD] RRT01 (slo-mo progression)

I predict synthetic diamond is the future for extreme high power. DCPCB has been used in military and space equipment, mainly for laser and CPU. The cost of synthetic diamond keeps dropping as the technology advanced.
This far, the nearest concept to DCPCB at mass production rate is AlN direct metallisation copper board.
Soon there will be copper based nano ceramic insulated MCPCB very similar to my previous board. The factory introduced it to me but the whooping $10.000 commitment cost held me back from even read the spec any further.

[Clemence]

More pics added in OP

:sunglasses: testing Clemence!

Apart from the nice graphs, I think it is nice to know that the 18350 Vapcell has a functional thermal fuse.

Thanks for the tests Clemence! Very useful.

Are you planning to change the driver too to add LVP? That seems like a tough job.

I would do aluminum for sure on mine. These are heavy lights, I agree. To lessen that weight would be great

I really want to if I have the skill. Need more time to learn building my own driver. I have long overdue programming lesson to begin with. As for now, simple mechanical fix to make it accept protected 18350 is the easiest solution

I won’t worry about the overheating problem since I will use heavier resistor to limit the output to about 300lm ish

[Clemence]

Definitely let me know on the Aluminum version. May need a few.

Far better would be for Jetbeam to update their circa-2012 driver design. They should be able to not only add at least a thermal stepdown and low voltage protection, but also achieve better efficiency and better regulation.

Although the new design looks a little bit nicer aesthetically than the old one, I’m unclear what functional improvements were made relative to the old version.

However, if you want a rotary and an HDS is out of the budget, this is apparently the best game in town despite the shortcomings. I’m looking forward to seeing what Clemence is able to come up with for a mod kit.

I haven’t seen any good protected 18350. I bought a bunch of the Aspire 18350 that is known to be the highest capacity 18350 in existence and some of the older Vapcell 18350 before the supplier changed their formula to a lesser capacity. Unfortunately there are no protected versions of those cells.

Hmmm limiting it to 300 lumens is kinda low. Your graph shows it starts at about 780 lumens. But not sure what else can be done.

I can’t believe Jetbeam didn’t implement any thermal step down or LVP for a light of this price.

300 lumens might be a bit low but the 400-500? lumens of my triple old style rrt-01 is more than sufficient for most tasks.

Keeppower and Eagtac have high capacity protected 18350s, but I haven’t tried them yet.

My experience is that 600lm for a S2+ is about the max it can sustain but it gets bloody hot already. The RRT-01 is a bit smaller and I would not want it bleeding hot, so 300lm sounds pretty sane. Maybe 400 because we are BLF? :smiley:

Ehmm….sorry for the confusion. I haven’t explain how I came up with 300lm number.

My calculation with small lights like RRT01, 5 LED wattage is already too much for sustainable bare skin handheld. And we also have to take driver heat into play.

  • With 4x R9080 E17A in parallel at 1A (250ma/LED), we get 330lm (300 OTF lumens) at only 2,8 watt. LED efficiency at 117lm/watt
  • With 4x R70 E17A in parallel at 1A (250mA/LED) ,we get 450 lm (405lm OTF) at 2,8 watt. LED efficiency at 161lm/watt

For pocket thrower application dedomed 119D/219D is the best choice. The beam will be tighter than an XPL-HI

  • With 1x R70 119D/219D at 1A, we get 415lm (373 OTF lumens) at 2,9 watt. LED efficiency at 143lm/watt

Those based on plain clear good TIR optic with 88 - 90% efficiency

[Clemence]

I vote aluminium pill
the weight reduction is a priority for me
the thermal transfer is 2x better than brass

I agree with a 300 lumen limit, for High CRI, to prevent melted LiIon battery wrappers.
I completely agree with the priority of the light NEVER getting too hot to touch.

In a safety for Granny scenario,
IF she tailstands the light on maximum using LiIon, I want her NOT to burn her hands when she touches it. I also want the light to shut itself off without overdischarging when she falls asleep.

or

both of those problems are solved by only giving her CR123 batteries… NOT LiIon, LOL

OK, 100pcs aluminum pills ordered. The material will be a mix of 2024 or 6061 depending on the availability. I bought aircraft scrap material from local aircraft factory. 3pcs test sample should be ready in a week or so. Although they’re scrap material, at least they’re truly “aircraft grade” aluminum :stuck_out_tongue:

[Clemence]

:+1: :+1:

Those maybe the only actual aircraft grade aluminium pills in the flashlight industry :party:

First 3pcs of aluminum pills. No wire holes nor screw threads machined. This will make modification easier to fit different MCPCB styles

[Clemence]

A successful weight loss program:

Stock brass pill = 17,08gr
New redesigned 2024 pill = 7,22gr

[Clemence]

Good job! Any idea why they use brass for stock pill when it is heavier, less thermal conductivity, and more expensive than aluminum?

I’m in for three