I gave a lamp to a friend who is passionate about Japanese motorcycles.
This lamp uses 5v LEDs and therefore you can use a simple smartphone battery charger with a USB-C connection.
The rear closure is blocked by screws of which I attach the link.
This lamp can be opened to be able to repair it in case it breaks.

M1.4x6

https://it.aliexpress.com/item/1005005914565896.html

M1.4x6

https://it.aliexpress.com/item/1005003223981956.html

the screw with the wide head is the most used.
The second screw is only used to block the usb-c connector but if you want you can use glue.

connector

https://it.aliexpress.com/item/1005007148475800.html

switch
https://it.aliexpress.com/item/32986608335.html