[Optisolis/E17A/E21A] Jetbeam Jet-µ

You can see the archived poll results on the Wayback Machine:


Hi All,

I’m planning to bring a simple AAA twisty with very high CRI. I’m getting into AAA EDC these days. They are very practical and a true EDC because it’s so small. My Fenix E05 saved me countless times even deep in the woods.
The plan was already proposed to the manufacturer with only few things remain.

The FL will have these features:

- Fenix E05 form factor

- 4 modes: 0,5lm - 20lm - 100lm - slow beacon at 100lm (approximate OTF using D240 E21A R9080. Less with Optisolis)

- Mode memory

- AAA only, no 10440 support

- IPX 7

- Pocket clip

- mod friendly

  • interchangeable TIR lens

The question is in the poll. Two different MCPCB required, that’s why I asked.
With E17A or E21A you can get whatever beam profile you like depending the optics. Longer regulated runtime
With Optisolis only micro lens TIR optics will work, expect 30° + FWHM. Shorter regulated runtime due to its higher voltage
Or…. is it better to provide both MCPCB? I know you guys won’t let anything sits unmodified for too long…

UPDATE181213: First run with E17/E21 and 757 copper MCPCB (+ Optisolis TIR optic test)

UPDATE181214: First runtime test and beamshots

UPDATE181215: Uncooled Jetusolis runtime test

UPDATE181216: JetuE21A runtime test (before - after optic modification)

UPDATE181217: Final runtime test result of both Jetusolis and JetuE21A prototypes

UPDATE181218: Some pictures of the the modifications, beamshots, and measurements

- Clemence

I voted for E17A/21A because it allows for a narrower spot, which I like more and in general seems more versatile to me. What you notice of the CRI difference between E21A R9080 and the Optisolis is only marginal and may appeal only to extreme snobs.

Having been involved in the development of a small AAA light myself, I’m looking forward to the design :slight_smile:

Me too, Optisolis seems to work best for general lighting not flashlight enabled yet. I’m not going to make this FL completely from scratch, that would requires a huge committed funding which I don’t want to do ATM. I’m going a custom order route just like my previous Armytek built.

- Clemence

E21a :slight_smile:

Voted E21A

Voted E21. For a different option.

Yes, I prefer too a narrow beam, better with a diffused lens; the old Fenix E05 27 lumens has a perfect beam of light, narrow with smooth transition

great options!
I like mode memory, it makes for a very versatile EDC… set to moon for nightstand duty, set for medium for daytime…

I hope the pocket clip works on a hat (bezel up option), that is a Very useful feature for hands free, although even without a clip, I sometimes just put a light under my hat, no clip required…

Considering how little energy is in a AAA cell, is there any chance of getting a lower medium mode?

Usually my most-used level on any light is about 5 to 10 lm, so on something like this I’d probably do the modes a little differently if possible. Like maybe 0.2 lm, 8 lm, 36 lm, 100 lm. Not sure if that can be done here, but I think it would be nice that way.

What does this mean? “Red/Green/Blue/Amber” It isn’t explained in the first or second posts.

I’m for a E21A as well, but the driver would probably be changed to a single-mode one by me

I was about to ask helps from any of you driver programmers there. And your name came to my to-ask list. This one should be easy to reprogram. The plan also includes an optional dongle for reprogramming (much later). This is still beyond my expertise ATM but I’m more than willing to learn. It uses PIC MCU instead of AVR.

MCPCB for E21A can work with E17A as well. And this broadens the choice to not only warm or cool white only, but also Red-Green-Blue-Amber E17A. E17A shares the same voltage characteristic with E21A, including their single color variants. Nichia use phosphors converted colored LED. Same forward voltage for all E17A and E21A family.

- Clemence

Phosphor converted single wavelength colors? What’s the advantage of that, besides having the same Vf across the board? I’d think that would be an inefficient way to produce those colors.

I voted E17A/21A If its a lower powered aaa I want throw. And I don’t even know what they are. I am just going off djozz post.

I’ve never actually attempted to use a PIC MCU. Tterev3 published some example code for the PIC10F322 though.

For now, the next MCUs I’m looking at are AVR models with more than 8 pins. But after I get the hardware abstraction layer written for those, maybe it’d also be feasible to add back ends for PIC models.

This obviously.

I voted for the E21A because I have tunnel vision, so a tight beam is normally more useful to me. What’s the tightest optic for this LED? 5° or 10° would be nice :slight_smile:

What will “slow beacon” correspond to? I like 0.5Hz to 1Hz, at 50% duty cycle. Tunnel vision again - it’s very easy for me to miss short, infrequent flashes. A brief flash once every 5 seconds - call it 0.2Hz at 5% duty cycle - would be useless to me, for example.

While I would be very happy to see an 5000K Optisolis and a 3500K Optisolis variant, beam versatility as a selling point made me chose E21A/E17A. I’d settle for a fine beaded optics with 15-20° beam diameter.

Phosphor converted color LEDs are also seem to be a good feature for E17A in my understanding.

For white LEDs, I’d choose 3000 or 3500K CCT for warm white option, and 4500K CCT for neutral white.

I think, output levels would be best like this: 0.5 lm - 4 lm - 25 lm - 100 lm.

I don’t know your possibilities, but if you could arrange a single AA EDC as well, I think, that would be also very good. (Single AA could be a better match with a single E21A emitter in term of max. recommended power level)