I made these for my gridbot v2, but many 2020/etc. printers or other machines can use this. It holds a little strip of lights that need 5V:
https://www.amazon.com/gp/product/B073YCX8WW
It is pretty dim, and I was hoping it would help me see first layer texture, but it doesn't help much.
Where it does help is when I connect to the control camera or get a message with a finished print at night.
After:
Before:
The red glow is from the BLTouch, so you can probably gauge how much light there is (nothing compared to the room lights or the sun in the window).
I cut an old USB cable and soldered the wires to the LED strip after it was installed. I measured the current and it was about 20mA, so I just plugged the USB into the pi on the front of my machine.
The author marked this model as their own original creation.