To inexpensively improve what you’ve already got, you could apply some DC-FIX to diffuse the light and get rid of the hotspots. Add another module which aims straight up. Add more modules if needed to achieve adequate coverage.
Designing and building anything is non-trivial, but considering you’ve already managed to make a nearly adequate solution, you are more capable than most in this regard. Making something smaller, lighter, and more refined will require more careful planning and component selection.
To fabricate a unit like the “meandre-technologie” one, purchase extruded or forged heatsinks. Mount an LED and optic to each heatsink. Make brackets to mount those heatsinks to a base plate. Select an adequate LED driver. Those are the basic ingredients. Extensive knowledge of available lighting components makes designing such a thing much less daunting, as does already having the requisite design and fabrication skills, and access to the required fabrication equipment.