Specifications: Supply voltage 12V, power 2X5 W.
Required:
Interior light from an old Soviet bus or other suitable locally.
Switch. A piece of profile for drywall, a piece of the docking strip from the same series, wires (length in place), a connector suitable for the connectors on the computer's power supply. M4-M5 screws with corresponding nuts, wood screws.
We mark the holes for the fixture on the piece of the profile, fasten the prepared profile to the right place with screws. We connect the wires to the plafond and fasten the plafond to the fixed profile with screws. On one wire of the circuit we make a break into which we turn on the switch, either solder the ends of the wire or fasten with screws (depends on the design of the switch), we fasten the switch in a convenient place. We solder the connector to the free end of the wire (black wires minus, yellow plus 12 volts on the power supply harnesses). We stretch the wire to the system unit and connect the connector to a free harness.