・Use LED tape
You can illuminate with LED tape easily.
These are LED tape.
I bought these in Amazon.co.jp.
Amazon.com sell this too.
There are several colors.
When it is connected to a 12V battery, it lights.
This is a 12V battery.
The form of this battery is like a N battery.
But they are different battery.
Cut it and use.
Solder lead wire on the break after cutting.
You can use it again.
I solder a switch, a battery case, lead wire.
A N size battery case is suitable.
The back is sticky.
But it's weak.
I glue it with Liquid super glue.
・Works
I used green LED tape.
The inside.
I can do ON/OFF with the switch.
Watch the video.
-LEV valve
You can use LED valves for car too by the same way.
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