Nothing like trying to search through your bags / luggage in the trunk with one tiny light on one side. Many months ago I upgraded to a Philips LED bulb. It was an improvement.
Today I stepped it up. I took the rear panels off. Cut a hole on the left side panel, and wired in a second trunk light.
It makes a major difference, expecially if your trunk is full of stuff.
To be noted, the new Philips Ultinon buld ( left side of trunk) is noticably brighter than the Philips Vision bulb (right side of trunk) which I bought 7 months ago.
The plastic panel is very easy to trim. I just used a Olfa utility knife. Then I spliced the wiring of the new light to the original light. Routed the wires over the headliner.