@Pibuz - No problem;
1. Import an elevation (I found one that had dimensions) and scale it correctly.
2. Draw a base line the correct width and then a vertical centre line up from this. Then using just line and curve tools draw the outline of half the lamp.
3. Extrude this a certain amount (does not matter how far).
4. Use 'Round Corners' plugin on the external edges.
5. I used 5mm radius on the 'shoulder' of the lamp and 1mm top and bottom, but whatever looks correct...
6. Delete the extrusion leaving the plain with rounded corners. * You could just draw small arcs on the original plane to get the same effect, I just prefer doing it this way.*
7. Select the outer edges and use 'offset' to define the thickness of the shell.
8. Delete the remainder of the plane that is not required.
9. Extrude again and use 'Round Corners' to curve inner edges at top and bottom. Again delete the extrusion as point 6.
10. Draw a circle centred on your original base line. Use a high number of faces for best results, I used 100 for these.
11. Select the circle and then click on 'Follow Me' tool and select the shell plane we have drawn.
12. Hey presto!
For the mapping I used Fredo06's ThruPaint plugin with the deformation setting. Doesn't always work but it's very useful for relatively simple shapes.
https://www.youtube.com/watch?v=l2QjLlUQVrY
Hope this helps.
Do you mind sharing that with very basic steps? No hurry, just when you have some time, if you can..