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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.
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 Series Ballast with 2 lamp Parallel
Replace 1 Lamp Series Ballast with 2 Lamp Series
Lamp Parallel Ballast
Lamp Series Ballast with Parallel
Lamp Series Ballast with Parallel 2
Lamp Series Ballast with Series
Replace 3 Lamp Two Parallel Ballasts with Parallel
Replace 3 Lamp Two Series Ballasts with Parallel
Ballast with Parallel
Ballast with Parallel 2
Ballast with Series
Replace 4 Lamp Two Series Ballasts with Parallel
Replace Fluorescent Tubes with LED
Direct-Wire Single-Ended LED Tube