EdgeLight is a new attribute on painted versions of the Honda Civic introduced in Rocket League Season 8. This is a unique painted body for both the Honda Civic Type R and Honda Civic Type R-LE. This painted body gives a new glowing effect on the trim at the bottom of the car. These can be found in the Garage in the Body tab after unlocking them.
Both the Honda Civic Type R and Honda Civic Type R-LE can be unlocked by leveling up in Rocket Pass Premium. The painted versions can be earned by reaching the Rocket Pass Pro Tiers above Tier 70.