I’m always on the lookout for good dual LED headlamp hosts for my projects. Those bikelight “headlamps” are just too bulky for climbers, we want slim and small, so I’ve never found a suitable metal host… until now… I saw a post on a caving forum that got me interested in the Fenix HP25R. Dual LED (spot and flood), dual switch, slim metal host… I just had to order one:
Because it’s a $80 light I did the mandatory stock test, didn’t like the UI (no individual control of LEDs) then ripped it apart. First things first, I needed to design a dedicated driver for it, so I took the measurements and got it pretty much spot on. I put in 8 x 7135s per LED and a FET for the spot LED (it’s double sided):
My previous attempt at a spot/thrower and flood headlamp failed miserably as I couldn’t help myself in putting an MT-G2 into it (Mod/build: MT-G2 & dual Nichia 219C headlamp). I was determined to do better this time… But when I saw the diameter of the spot lens I had to test fit a quad… And it fits almost perfectlyt! How can I NOT make a quad of this? Impossible!
I filled the lens holder up with copper washers and thermal adhesive, and some thermal grease for the quad MCPCB:
Everything is a snug fit. The 10mm flood LED MCPCB has a nice retaining ring too. The battery pack and cable are very decent too, no need to replace the wiring. Definitely a mod friendly headlamp host:
Driver is a good fit, and wiring it up it all fits inside:
With a high drain cell it produces some serious output for a headlamp… but in regards to making a spot and flood headlamp I’ve just racked up yet another failure… But once again I just could not help myself. How could I not make a quad with such a perfect fit? This light was simply meant to be a quad. I’ll just have to order another and try again.
I have some work to do in regards to firmware as I haven’t had dual LEDs and dual momentary switches before. Right now I’ve just got the basic functionality working, but with 16KB flash memory and two switches I think I can do pretty much anything I want.