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How to Replace 1 Lamp Rapid Start Ballast with 2 lamp Instant Start

A 1 lamp rapid start (series) ballast can be hard to find, but it can be replaced with a 2 lamp instant start (parallel) ballast. Here is how a 2 lamp ballast is wired to a 1 lamp fixture.

Rapid Start Ballast Diagrams

Factory wiring

2 Lamp Instant Start Ballast Diagram

2 Individual wires, 1 common wire

1 Lamp Rapid Start Ballast Replaced with 2 Lamp Instant Start Ballast Diagram

Replace

Ballasts

Replace 1 Lamp Rapid Start with 2 Lamp Instant Start

Replace 1 Lamp Rapid Start with 2 Lamp Rapid Start

Replace 2 Lamp Instant Start

Replace 2 Lamp Rapid Start with Instant Start

Replace Alternate 2 Lamp Rapid Start with Instant Start

Replace 2 Lamp Rapid Start

Replace 3 Lamp Instant Start

Replace 3 Lamp Two Instant Start with One Instant Start

Replace 3 Lamp Rapid Start with Instant Start

Replace 3 Lamp Two Rapid Start with One Instant Start

Replace 3 Lamp Programmed Start with Instant Start

Replace 3 Lamp Programmed Start with Rapid Start

Replace 4 Lamp Instant Start

Replace 4 Lamp Two Rapid Start with One Instant Start

Replace 4 Lamp Rapid Start with Instant Start