Giving the Fenix E0 a new lease on life

I've been looking at this bluish tinted Fenix E0 and thought it needed a little bit more umph, and it would be nice if it was white.

Meanwhile, I've got these CREE XR-E sitting here, just begging to be used.

It struck me that I could use the XR-E in the Fenix E0, and a mod was born.




The Fenix E0 is not actually fully regulated, so, with the lower Vf LED, it pulls extra current out of the battery.

Output 68.67mA 2.81V = 0.192 W

Input 1.384V * 187mA = 0.259 W

Converter Efficiency 74.6%

Output is roughly 19 lumens before "reflector" losses

The XR-E LED is roughly 99 lm/W at this drive level.

Very slick! Any pics of the mod?

Paul

Nice!!! Brighter and wider beam!

Was there much threadlocker?
Did you have to trim the cree down much to fit?
Pics of the mod!!

Very nice!

NIGHT & DAY!! WOW!

NewBie said:

...Output is roughly 19 lumens before "reflector" losses

The XR-E LED is roughly 99 lm/W at this drive level.

Click to expand...

99lm/W

hey, the 3mm led doesn't really use the reflector right?

Looks like you'll get 6 or 7 hours of runtime out of that.

Were the exposures locked for the two pictures? If so, I'm impressed!

I fiddled with the LED and came up with something that was half hotspot, and lots of flood:




Part way thru light engine mod:




The face is a bit worn on this one, but you get the idea:




Let there be light:




Something for reference:




Something else for reference:

It's a thing of beauty!

Wonder if Fenix will send you a few E0 XRs as freebies for your R&D? Great work and it makes me wish I had an E0 laying around.

I'd definitely buy one of those. Are you willing to make more?

I like your thinking Newbie!

you think it can handle a 3.7V Li-Ion AAA? :naughty:

Hmmm... I'd like to attempt this. Nice looking beam. Efficiency isn't too bad, either. Simple enough for a ditzy klutz like myself to do.

Hope you don't mind a few simple questions, Newbie -

NewBie said:

I fiddled with the LED and came up with something that was half hotspot, and lots of flood:

Click to expand...

I imagine you had to deepen and enlarge the recess in the backside of the reflector, in order to insert the LED deep enough to create this nice beam profile?

Any modification to the reflector's surface shape, itself? (it appears to be stock, but...?)

Is that Kapton tape on the emmitter ring, for electrical isolation?

I'll (now) have to pick up a few of these XR-E's to toy around with. Too cool, Newbie!

My EO is on its way to you. Address: Newbie in Oregon.

Nice work.

All the best,

oregon

I had to slightly drill out the existing LED hole.

I had to deepen the recess.

Kapton tape I put there was due to the soldering area being very close to the ring, and I was shaking a bit that day, so it prevented accidental solder on the ring.

I forget offhand, which circuit they used in there, unknown on the Li Secondary.

Thanks, Jar. Go easy on that mocha! :duh2:

.

I want this done to my E0 is it difficult, what tools do you need, where do you get the led?

Will this make your E0 no longer waterproof (I use mine in and around water almost daily). True or False?