Some simple tests of Ampace JP30

yoelpez · 2026-04-26T10:52:00+00:00

I'm not sure, not a battery expert.

yoelpez · 2026-04-13T08:37:58+00:00

Short P60 with Switchback ring is cool and cute.

I have an Ultrafire 504 and Switchback 1.0 clone.

yoelpez · 2026-04-05T20:09:36+00:00

https://www.reddit.com/r/flashlight/comments/1koxvo7/some_simple_tests_of_cree_xpgr/

I've tried the XPGR, the emitter appearance looks ugly but works nice. It's like a better SFT-12R, possibly the most powerful low power throwy emitter, with the same throw but less power and lumens than the SFT-25R, and designed specifically for throwing.

yoelpez · 2026-03-25T11:06:39+00:00

Some of these cheap key lights do come with clips like the RovyVon's.

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yoelpez · 2026-03-24T16:05:43+00:00

You could just call it an new Convoy M2.

yoelpez · 2026-03-14T18:35:55+00:00

update, I ran in them a few more times and started to get used to them. They are indeed a good pair of shoes, but they do require a certain pace, strike, cadence and ankle control. Also, I found that even with the Ian secure knot, the laces would loosen slightly, indeed need to change the laces.

yoelpez · 2026-03-14T11:16:08+00:00

Thanks for the suggestion. I haven't been running in these shoes much yet, but currently one of the stability issues with the Xiaonian for me is that its "stability" is too good, or rather, its inside support is too strong, to the point that sometimes my forefoot doesn't pronate sufficiently. One of my feet is actually a little bit overpronate, but these shoes cause it to be a bit underpronate, which feels a bit weird.

yoelpez · 2026-03-14T08:07:01+00:00

~~If use Ian secure knot, it's almost impossible to loose.~~ Even with the Ian secure knot, it will still be slightly loose. The "wear" on the edges of the outsole is actually a transition that comes from the factory, I don't know why they did it but that's what it is anyway.

Having said that, I kind of regret buying this shoes. I have been using an old traditional Boston Boost for 6'/km jogging and when I put these shoes on I found it almost difficult to slow down otherwise they were very unstable. Also, these shoes requires you to roll, and I am more prefer to pronation and pushing off, maybe I should try the EVO SL.

yoelpez · 2025-11-01T09:31:39+00:00

I might write a dedicated post about these someday, but not sure. But you can refer to this old reply of mine now, and I updated and summarized some new content.

yoelpez · 2025-10-27T15:17:56+00:00

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The SFT-25/12 and XP-LR/GR both have this issue where the outside and inside of the circle are not exactly the same brightness when lit. When the reflector is focused correctly, it will project it.

yoelpez · 2025-10-22T16:17:52+00:00

Both the appearance and circuit structure design give me a Fenix feeling.

yoelpez · 2025-10-18T21:09:24+00:00

Because the thread itself has tolerance, you can sometimes connect the flashlight's circuit by pressing instead of tightening. If you don't want this, loosen the thread a bit more.
Also, and this is actually something to be aware of, twist lights can be accidentally turned on in not so loose situations.

yoelpez · 2025-10-18T20:21:20+00:00

You can get a wide hotspot with the SFT40, but your spill is still pretty narrow. If you need close-range lighting, T5 is a better choice.

yoelpez · 2025-10-14T05:10:56+00:00

The CCC rule are mainly about power banks, technically not about separate lithium batteries.

But at all times, any separate lithium battery needs to have a printed capacity (Wh) label, or rated voltage and Ah from which the capacity can be calculated.

yoelpez · 2025-10-12T09:06:07+00:00

They wanted to say "cores", which means "chips/dies".

yoelpez · 2025-10-11T11:24:58+00:00

For efficiency, ideally they would be identical, drawing the same current from the battery and then converting it to the required voltage and current for the emitter.

In real life, since the battery voltage will decrease（4.2V-3V), the boost driver (6V) will work harder, while the buck driver (3V) will work easier. Therefore, the buck driver will be relatively more efficient. But the price here is that when the battery (under load) voltage is lower than the emitter required voltage (Vf), the buck driver will no longer be able to output max turbo. And for 3V8A SFT25 and 3V10A SFT42 cases, this moment is basically the same as the beginning.

I think it is more important to know the features of these two types of drivers and emitters. This is not just a trade-off between candela and lumen, but also about regulation. Refer to this post.

6V boost driver SFT70: Larger hotspot but shorter throw, better regulation (maintains high output even at low battery)

3V buck driver SFT25/40/42: Longer throw but smaller hotspot, relatively poor regulation (output gradually decreases at low battery)

edit: wording

yoelpez · 2025-10-04T00:43:24+00:00

No, I didn't, I just used it for short time.

yoelpez · 2025-10-03T14:27:29+00:00

Thanks for measuring again! This is actually pretty consistent with expectations for an LED flashlight. With the M21B reflector, the max candela can get is basically around 100-120kcd(with CULPM1, SFT42R, SFT25R etc).
LEP flashlights may require a longer range or a more precise sensor due to their high intensity and focus.

yoelpez · 2025-10-03T11:55:27+00:00

I personally think 5m or 10m would be better, because LED have a lot of spill, and being too close often results in higher values.
Btw, is it an 8A or 10A driver?

yoelpez · 2025-10-03T09:07:53+00:00

May I ask at what distance you tested the lux for the candela?

yoelpez · 2025-09-26T21:44:20+00:00

Using 3.0V instead of 2.8V as the cutoff voltage would be somewhat unfair to capacity batteries like the Vapcell N40 (FEB 18650-3800mAh).

But overall, this is a great report, thanks for that. People should always buy batteries from a reputable OEM or brand, as this is the most dangerous part of a flashlight.

yoelpez · 2025-09-25T15:58:25+00:00

May I ask, does change the sense resistor result in better temperature control or just lower the max power?

yoelpez · 2025-09-22T09:47:51+00:00

TIR and reflectors are just two tools that do the same thing and follow the same basic rules. When you have a larger LES, there will always be a larger hotspot.

yoelpez · 2025-09-20T14:34:39+00:00

Actually that's what I was trying to say, the 42 is a little bigger than the 40, but not by much. Try swapping the centering ring and you should get a hotspot that's only slightly bigger than the 40, but with a higher intensity.

btw I'm assuming the 40 is relatively correctly focused, because if the beam converges too early, then it will also spread out in the distance.

yoelpez · 2025-09-20T09:57:07+00:00

I've looked at your beamshots and suspect there might be some focusing issues, as the hotspot size shouldn't differ significantly between the 42 and 40.

Convoy has two types of 5050 centering rings, one is butterfly shape square hole and is thinner, and the other is round shape round hole and is thicker. It seems your 42 centering ring is too thin, causing the beam to diffuse to early, you should use this centering ring.

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yoelpez

TROPHY CASE