The original Indy Lights series was formed as an open-wheeled racing series that acted as a developmental formula for CART from 1986 to 2001. Originally known as the American Racing Series (ARS), in 1991 it was renamed Indy Lights results
As a one-make series, Indy Lights used March chassis (renamed to Wildcat) from 1986 to 1992. In 1992 Lola became primary chassis constructor, using a modified F3000 chassis. Both used Buick V6 engines.
CART cancelled the championship after the 2001 season. The Infiniti Pro Series was founded by the Indy Racing League the following year. Also a one-make series, it used a Dallara chassis with a TWR-developed, Infiniti badged engine.
The series once again became known as Indy Lights when the IRL and Champ Car merged for the 2008 season, and saw bumper grids, not seen since the heyday of the original series in the mid-90’s.
Following the appointment of a new promotor, Andersen Promotions, in 2014, a number of cost-reducing updates to the chassis and engine package were implemented including a new Dallara chassis and a 2.0L turbocharged AER-developed engine badged by Mazda (through 2018).