Step 1: Parts in Details
I used several copper stuff from the plumber as you see, some brass screws, a wodden hand made box (by my own, as a carpenter I am) and a special brass socket E-27 from a big bul called: "centra-beam"-bulb. There is also some copperwire 4 mm in the diameter and other parts of electrical stuff like brass "Lüsterklemmen" needed.
Step 2: The Optical Parts
To hold the lens in front of the lantern, I took an keyholding ring placed the lens in and fixed it with the "Lüsterklemmen" (sorry I don`t know the right translation). The reflector is made of an old tea spoon