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A 1 lamp series ballast can be hard to find, but it can be replaced with a 2 lamp parallel ballast. Here is how a 2 lamp ballast is wired to a 1 lamp fixture.
1 Lamp Series Ballast
Replacement 2 Lamp Parallel Ballast Wiring Diagram
Ballast wire colors can vary depending on the type of ballast or country of origin. Below are the same diagrams with different wire colors. The ballast from this example is from a desk lamp.
After 1 Lamp Series Ballast is Replaced with a 2 Lamp Parallel Ballast
2 Individual wires, 1 common wire
Lamp Parallel Ballast
Replace 1 Lamp Series Ballast with 2 Lamp Series
Lamp Series Ballast with 2 lamp Parallel
Lamp Series Ballast with Series
Lamp Series Balast with Parallel
Lamp Series Ballast with Parallel 2
Replace Two 2 Lamp Series Ballast with Parallel
Lamp Series Ballast with Parallel
Ballast with Series
Ballast with Parallel
Ballast with Parallel 2
Direct-Wire Single-Ended LED Tube