besides the search system for UAS, answering questions in ibeacon post, we've been developing some new designs.
Here are some bakery right off the DIY bench for your attention, dear pilots, developers and implementors.
These naked babies, tiny PCB modules are instances of Switch mode Constant Current High power Buck (step down) converters, made to deliver up to 3A of solid constant current (with no flicker) to a LED module like good-old Cree XML-T6 and to be dimmed up to 20 kHz pwm high frequency or just switched logically with no drain on or off as well.
Some details I tried to cover in short video on 3A LED Driver
One of these modules connects directly to your 3 or 4 cell LiPo battery and feeds up to 4 High current LEDs connected in series from 4 cell LiPo battery or up to 3 from 3 LiPo cells
The lower one is three channel Constant Current Buck tuned to run with an RGB powerful LED like one in the middle of the photograph. This three channel one was implemented to serve as a state and event external indicator for an autonomous system.
Cheers, and you're welcome with any questions you like, as always.