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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
Replace 2 Lamp Parallel Ballast
Replace 3 Lamp Parallel Ballast
Replace 4 Lamp Parallel Ballast
Replace Series Ballast with Series
Replace 1 Lamp Series Ballast with 2 Lamp Series
Replace 1 Lamp Series Ballast with 2 lamp Parallel
Replace 2 Lamp Series Ballast with Parallel
Replace 2 Lamp Series Ballast with Parallel 2
Replace Two 2 Lamp Series Ballast with Parallel
Replace 3 Lamp Series Ballast with Parallel
Replace 4 Lamp Series Ballast with Parallel
Direct-Wire Dual-Ended LED Tube Lights
Direct-Wire Single-Ended LED Tube Lights