I have seen the same thing testing batteries at higher currents. The warmer the battery the better it will perform.
If you run a capacity test on the same cell twice and don’t give the cell a rest after the first test after charging the cell, It’s warm from the test and charge. It will tend to have better performance on the second test with usually less voltage sag and higher current. I have noticed it most with the smaller cell sizes.
In all type of cells, being based on a specific chemistry, benefit from higher temperatures in terms on internal resistance along with capacity because of the faster ion movement permitted by higher temps. Although in terms of current provided, it obviously has its limit because of electrical conductivity dropping with temperature.
So don’t push it say above 40-45C, except for high discharge cells, for good cycle life obviously.
This can be used in a certain way to actually be beneficial though:
When discharging in cold weather, internal resistance is increased. However, heat dissipation is increased. So, as you discharge the cell in colder weather, performance actually gets better
OK, the prototyping is final. Below are the runtimes for Jetusolis and JetuE21A compared to stock XPE2. All measured in cooled 25° condition to avoid fluctuation in battery capacity as encountered earlier,
I will post the beamshot with alternate optics later.
OK, the prototyping is final. Below are the runtimes for Jetusolis and JetuE21A compared to stock XPE2. All measured in cooled 25° condition to avoid fluctuation in battery capacity as encountered earlier,
I will post the beamshot with alternate optics later.
- Clemence
Those look good to me. Very reasonable compromise in output for the significant improvement in CRI.
Since the 5000K Optisolis uses a 420nm diode, compared to the more conventional 440nm diode in the warmer Optisolis variants, with a consequently higher forward voltage, I’m guessing the warmer versions will consequently run a little bit longer at the same current.
Only up to 10°. At very close range this 10° with its rectangular tight spill already creates some artifacts, the 5° will be worse I guess. The narrow spill is very useful in cases such as mouth or nostril inspection where you don’t want too much glare to the patient. I myself prefer the 20°. The stock optic has bad yellow tint shift ring around the hot spot.
Only up to 10°. At very close range this 10° with its rectangular tight spill already creates some artifacts, the 5° will be worse I guess. The narrow spill is very useful in cases such as mouth or nostril inspection where you don’t want too much glare to the patient. I myself prefer the 20°. The stock optic has bad yellow tint shift ring around the hot spot.
- Clemence
Thank you!
I have tunnel vision, field of view well under 10°, so I’m always on the lookout for lights that put all the light where I can use it. 10° would still be pretty good, though
UPDATE181221: Maukka calibrated Jetusolis
If you guys interested to make a calibrated light using this Jetusolis, you can ask Maukka and check this thread: http://budgetlightforum.com/comment/1431561#comment-1431561
The pricing for Jetusolis:
1 – 3 pcs = $28,5/pc
4+ pcs = $27/pc
Sorry, forgot about that. The price:
- Jetusolis is $27 – 28,5 depends on quantity
I haven’t officially launch it to my store but you can fill the interest list in Maukka’s thread
Of course if you don’t need the data, just order from Clemence when he makes them publicly available in his store. No reason to include an extra step in that case.
Of course if you don’t need the data, just order from Clemence when he makes them publicly available in his store. No reason to include an extra step in that case.
Thanks for the clarification.
—
Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand
Any chance of buying a couple of those 20° TIR optics from you?
It’s pretty hard to find something decent in that size via the normal pleb channels..
Or maybe you got them from Yajimei?
Any chance of buying a couple of those 20° TIR optics from you?
It’s pretty hard to find something decent in that size via the normal pleb channels..
Or maybe you got them from Yajimei?
All those TIR optic prices are all the same at $0,2/pc. Both types of the MCPCB price is $1,58. You can order them via the store soon (before Monday)
You might want to wait for the 30°optics next week, currently only few left. The vendor sent me wrong optics earlier.
FYI, they fits Fenix E05 too
I have seen the same thing testing batteries at higher currents. The warmer the battery the better it will perform.
If you run a capacity test on the same cell twice and don’t give the cell a rest after the first test after charging the cell, It’s warm from the test and charge. It will tend to have better performance on the second test with usually less voltage sag and higher current. I have noticed it most with the smaller cell sizes.
In all type of cells, being based on a specific chemistry, benefit from higher temperatures in terms on internal resistance along with capacity because of the faster ion movement permitted by higher temps. Although in terms of current provided, it obviously has its limit because of electrical conductivity dropping with temperature.
So don’t push it say above 40-45C, except for high discharge cells, for good cycle life obviously.
This can be used in a certain way to actually be beneficial though:
When discharging in cold weather, internal resistance is increased. However, heat dissipation is increased. So, as you discharge the cell in colder weather, performance actually gets better
OK, the prototyping is final. Below are the runtimes for Jetusolis and JetuE21A compared to stock XPE2. All measured in cooled 25° condition to avoid fluctuation in battery capacity as encountered earlier,
I will post the beamshot with alternate optics later.
- Clemence
https://www.virence.com/
Those look good to me. Very reasonable compromise in output for the significant improvement in CRI.
Since the 5000K Optisolis uses a 420nm diode, compared to the more conventional 440nm diode in the warmer Optisolis variants, with a consequently higher forward voltage, I’m guessing the warmer versions will consequently run a little bit longer at the same current.
UPDATE181218: Some pics and measurements
- Clemence
https://www.virence.com/
When will they be available to order?
Looks nice
Do you have any 5° TIRs, by any chance?
Only up to 10°. At very close range this 10° with its rectangular tight spill already creates some artifacts, the 5° will be worse I guess. The narrow spill is very useful in cases such as mouth or nostril inspection where you don’t want too much glare to the patient. I myself prefer the 20°. The stock optic has bad yellow tint shift ring around the hot spot.
- Clemence
https://www.virence.com/
What are the CRI and CCTs of these E21A and Optisolis emitters?
R9080 minimum for the E21A and way higher for the Optisolis. Judging by Maukka’s test results, its currently the highest CRI LED available today.
- Clemence
https://www.virence.com/
also check out the detailed info on his site, for example:
https://www.virence.com/product-page/nichia-nvsle21at-nvswe21at
How to hide signatures, and ignore someone, http://budgetlightforum.com/node/44835?page=3#comment-1438048
Even better than Yuji D50 LEDs??
2Q19
https://www.virence.com/
Thank you!
I have tunnel vision, field of view well under 10°, so I’m always on the lookout for lights that put all the light where I can use it. 10° would still be pretty good, though
Aspheric+spacer?
The reflector is H units high, so you can fix an aspheric lens H units above the LED to “zoom” it somewhat.
Problem is finding the right lens…
09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
Ah... indeed..
Dang, i paid good money for a bunch of those Yuji's...
O well..
2Q19
So will these actually be sold? Looks very interesting.
Yes they are. Supposed to start the production yesterday but I’m still sick right now.
- Clemence
https://www.virence.com/
Oh sweet. That’s awesome!
Hope you feel better soon!
UPDATE181221: Maukka calibrated Jetusolis
If you guys interested to make a calibrated light using this Jetusolis, you can ask Maukka and check this thread:
http://budgetlightforum.com/comment/1431561#comment-1431561
The pricing for Jetusolis:
1 – 3 pcs = $28,5/pc
4+ pcs = $27/pc
- Clemence
https://www.virence.com/
I dont see pricing or where to even purchase
Sorry, forgot about that. The price:
- Jetusolis is $27 – 28,5 depends on quantity
I haven’t officially launch it to my store but you can fill the interest list in Maukka’s thread
- Clemence
https://www.virence.com/
Damn Indonesia to Finland to US. Wonder if I will get it before the end of 2019.
If it makes sense you should ship as once big batch expedited to maukka
Correct, that’s the idea hence Maukka’s interest list
https://www.virence.com/
Of course if you don’t need the data, just order from Clemence when he makes them publicly available in his store. No reason to include an extra step in that case.
Thanks for the clarification.
Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand
Hey Clemence,
Any chance of buying a couple of those 20° TIR optics from you?
It’s pretty hard to find something decent in that size via the normal pleb channels..
Or maybe you got them from Yajimei?
2Q19
All those TIR optic prices are all the same at $0,2/pc. Both types of the MCPCB price is $1,58. You can order them via the store soon (before Monday)
You might want to wait for the 30°optics next week, currently only few left. The vendor sent me wrong optics earlier.
FYI, they fits Fenix E05 too
- Clemence
https://www.virence.com/
Great!
Thanks.
Yeah, 30° is usually the best for a TIR (i.m.o.).
2Q19
So we keep ckecking Virence for the release of these?
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