Something I copied from a thread on another forum some years ago, but which may prove useful to folks on here. Any comments, corrections or additional information is very welcome:
18W SOX use 4 to 5uF capacitors
35/55W (ignitor gear), SOX 50w MBF lamps use 6uF or 6.5uF capacitors
60W SLI/H, 80W MBF/U or 50W SON lamps, use 8uF capacitors
90W SOX (ignitor gear), 125W MBF or 70W SON Metal Halide lamps, use 10uF capacitors
100W SON/Metal Halide lamps, use a 10 or 13uF capacitor
35/55W SOX (Leak gear), 150W SON, 250W MBF/U, 2.15 Amp Metal Halide Lamps use a 13 to 16uF capacitor
90W SOX (Leak gear), 140W SLI/H (Leak gear), 400W MBF/U, 3.15 Amp Metal Halide lamps use a 20 to 25uF capacitors
135W/180W SOX lamp on a Philips L4135 Ballast uses a 20uF 300v capacitor, or a 15uF 440v on other makes e.g GEC, Parmar etc
135W SOX on Philips ignitor gear, 6.8uF 400v.
The Philips CWA Ballasts for SOX-E are different as they are rated from 300 to 660 volts - best check control gear
250W SON, 700W MBF/U or 3 amp Metal Halide lamps use 32uF capacitors
400W SON or 4.5 amp Metal Halide Lamps use a 40uF capacitor
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