I got two 10W LEDs from eBay auctions. They were reaaaally cheap, and came each with their own driver. So all I had to do was an enclosure.
I fired up Catia and the 3D printer, and… I've to say I'm happy with the result:
From the first idea to the second prototype assembled, it was reaallly quick,3-4hours maybe. Some details could be improved: