LEP + LED flashlight: Lumintop Thor Pro [discussion + review]

Thanks for the measurements, dave1010!

That’s a bit long (26mm longer), but otherwise pretty similar dimensions to the Lumintop GT3. Certainly much more compact than competitors. Quite heavy though.

10k+ lumens and 1400m throw in something pretty close to jacket-pocketable (if my GT3 is anything to go by) seems like it could be a really compelling light!

Another interesting competitor/comparison to this light will be actually carrying 2 lights. Like, you could carry a Emisar D18, and Lumintops own thor 1 or 2, and it would probably be less weight, and possibly less bulk than this light. Of course you don’t have both available at the same time like you do with this.

The LEP to LED optic ratio seems off.

The floody LED optics should be smaller and the LEP larger, imo

Thats my opinion,too

Regards Xandre

Yeah, I agree.

I think more like the proportions of this Fenix would be good.

If it was more like the Acebeam X80-GT or Manker MK34 II with lots of floody XHP50.2 LEDs with a LEP diameter more like the Thor II (or even bigger) then it could get more flood and throw.

It’d be less balanced though. Another possibility is having throwy LEDs (W2 or SFT40), so the switch from LED to LEP is less significant.

W2 and SST20W for the ‘flood’ emitters, maybe 12 of them, and smaller optics. ~45mm optic for the LEP. Specs would be much more impressive in my estimation.

Do you mean combining W2 and SST20 or triple channel?

It would be cool to switch between

  • High CRI warm flood light
  • Throw LED
  • LEP

Though that’d make 6 combinations if you could use them in pairs, which would be a complex UI.

No. Dual channel. Just giving the emitter options. High lumen or high cri, but both options giving best cd/lm in their class

I’ll probably buy this however the leds are configured because any combo like this will be useful for boating.

But, I wish it had narrow TIRs for the ‘flood’ LEDs and at least neutral tint (high CRI not required). Use the LEP from 1.4km to 600m, and then the LEDs from 600m to 200m.

I’ll keep dreaming! Or maybe, if the sizes are right I can mod for that.

TIRs are almost always preferred by me these days, so I’ll agree. Also, I did some very quick and dirty layout measurements, and a ~32mm LEP and 12* ~13mm LED optic with 5mm emitter hole could yield ~170kcd and 12k lumens with the W2 running 50A total (Vf would be ~3.2V). The same LEP with the bigger optic should yield ~750kcd.

I don’t know if the driver (resistance wise) can deliver that much more amperage. The prototype on your cells is only pushing ~20A it appears with an emitter Vf of ~3.25V.

I’ve re-tested with 4 high drain Sony VTC5A cells, which should push it to its limit.

It now hits 8375 lumens with the XP-G3 LEDs and the LEP, up from 7238 lumens, which is a 16% increase. A few more numbers on the second post.

I haven’t tested throw again but the LEP-only lumens didn’t change much.

Remember that this is still a prototype. The final version might be identical or could push 8 XHP50.2s over 20,000 lumens.

I estimate then about 32A total, 4 per emitter. Vf around 3.4V. This would suggest a circuit resistance of 20mOhm assuming each vtc5a is about 15mOhm. Not bad, but maybe could be improved some. Are springs bypassed? What FET (s) does this driver use?

According to these assumptions, 8 * 50.2 should put out about 17k otf and 48A

Mostly I use my lights in manners that need lots of juice, 4x21700 would be great.
Also, NW or 4000k would be great.

Thanks for the numbers. I’m trying to follow along, so I can work it out for other lights…

  • 8400 lm over 8 LEDs is 1050 lm each
  • 1050 lm plus a bit for losses takes 4A with a Vf of about 3.4V, according to Cree XP-G3, testing a R3 4000K 90+CRI emitter
  • Resistance is Volts over Current, so total resistance is 3.4V/32A = 106mOhm
  • VTC5A is specced at 13mOhm (Mooch measured 18.6), so 15mOhm each is reasonable
  • 4 cells makes 60mOhm from the cells, leaving 46mOhm for the circuit.

Where have I gone wrong?

The springs aren’t bypassed with wire but there are smaller springs inside too.

I’ll take some more photos before trying to take it apart. I think the charging circuit needs to be removed to get to the springs.

Voltage sag, not Vf is the number to use in the ohms law equation. 4.15-3.4= ~.75 @ 32A >>~23.5 mohm

Another error is the parallel resistance of the cells. Divide not multiply. 15mohm/4 = 3.5 mohm

So very roughly, 20mohm is circuit R

Does a magnet stick to the springs?

Thanks! That makes sense.

No, not magnetic.

Here’s a picture of them

This looks like an awesome light but with two separate light sources, I would expect to control them using two separate switches. Going through multiple click hoops to get what you want seems really cumbersome. The Fenix LR40R got it right in this regard.

I think anduril2 works great, without more buttons.

2 independent switches would help in some ways but hinder in others. For example going to turbo on both channels would require 2 double clicks.

The Thor Pro UI is good but there’s not a good way to jump to turbo on both channels quickly if you’re just using the LEDs.

Ideally the UI would let you have the LEDs on low or medium then quickly switch to LED+LEP on turbo for a bit, then back to just LED.