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

clemence wrote:

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.

When will they be available to order?

Looks nice

Do you have any 5° TIRs, by any chance?

What are the CRI and CCTs of these E21A and Optisolis emitters?

twisted raven wrote:

What are the CRI and CCTs of these E21A and Optisolis emitters?

clemence wrote:

twisted raven wrote:

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

clemence wrote:

Phlogiston wrote:

Looks nice Thumbs Up

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

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…

clemence wrote:

!{width:80%}https://farm5.staticflickr.com/4876/46365904341_d2d77aafe1_o.jpg!

Ah... indeed..

Dang, i paid good money for a bunch of those Yuji's...

O well..

So will these actually be sold? Looks very interesting.

Oh sweet. That’s awesome!
Hope you feel better soon!

I dont see pricing or where to even purchase

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

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.

maukka wrote:

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.

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?

Great!
Thanks.

Yeah, 30° is usually the best for a TIR (i.m.o.).

So we keep ckecking Virence for the release of these?