This is light bracket for a LED light bar I bought at Walmart. Print two of these, slide on the top rail on the Creality Ender 3 and Snap light bar into place. Simple bracket made in TinkerCad. This bracket is a tight fit.

This is the LED bar I bought from walmart, it uses a standard wall plugin. This light is pretty bright so you might have to add some tape on the front side to keep from getting blinded.

https://www.walmart.com/ip/Lights-Of-America-12-Linkable-Led-Undercabinet/113083318