The old lampshade was made from cardboard and aluminium foil. Just a quick and simple solution, but it didn't look too nice. So today, i finally cut out some aluminium sheets and drilled holes in them to make a new one - and it turned out quite nicely. 

I might add some corner pieces in the future, but for now, it is good enough. At the corners, there won't escape too much light anyway, since it is blocked by the lamp frame. 
Also, i might add one more bend to each of the shade pieces. This way, i could approxmiate a parabolic reflector a little better.
Also, the shade needs a painting on the outside. Maybe black with a waterdrop effect. 

First, however, i will work on the cooling system some more. I've got a really cool idea for a visual effect, which has something to do with the fans already being synchronized. But i won't tell too much, you have to be patient :P