So, it works, that is the main thing. The next steps to take are:

• Put all components onto a proper circuit board.
• Add velcro to diffuser sheet (mabye add another one on the inside).
• Add a clock.
• Try some 60 LED/metre strips.
• Do something better with the buttons, brightness up/down buttons for example.
• Look at touch sensors again, probably using a dedicated chip.
• Add a mini desklight extension.
• (in the future) Tie it all into a room network using WIFI/Zigbee or something similar. (This will enable such features as 'Sunrise alarm mode' to be in sync accross all the lights in the room.)