Feron TL3020 LED upgrade conversion kit

Prehistory: Fluorescent lamp gone and I didn't find replacement in local shops.
I could throw lamp to the trash but I decided to upgrade it to LED lamp.

Old lamp sockets (holders) have been removed as electronic block.

I opened OpenSCAD software and started design new things.

Meanwhile I purchased a 12V 24W power supply unit. I have some LED strips and wires on hands. So, I took out PSU from it's enclosure and made just an insulating holder. PSU board has been hot glued inside holder a