The images are great, Alek ... I've been doing something similar with Ikea clip-on desk lamps, baking parchment & kitchen tin foil (no box as yet). For my speciality, though (food), I'm not always overjoyed with the results I get. I definitely prefer natural light (which also has its challenges!). Still, it's good to know that it's possible to get decent results with a bit of experimenting without spending the earth! All the best.
Could you tell: 1) What is bulb power? 2) What is appr. the box sizes? 3) What side of your parallelepiped serves as window for shooting: butt-end edge or one of the 'long' sides (excuse me for my non-perfect English)? 3) Video shows not only "daylight" bulbs but also some special p h o t o - lamps, or it is my mistake?
I like your idea much and would like to try it. Thanks for sharing!
7d + lenses: Canon EF-S 15-85mm/3.5-5.6 IS USM & EF 100mm/2.8 USM Mac...
The bulbs I was using are 13watt florescent bulbs which are equivalent to about 25 watt incandescent bulbs. The box in the video is about 1 foot (30cm) on each side. The front side may be a little wider. I place the subject in about the middle of the box and shoot from the open side with no fabric. The lamps I was using are no special lamps, they are just what I had around the house. Any kind of lamp that you can put a light bulb in will work.
I hope this helps and please respond if you have more questions. Thanks!