No. 150w is what the lamp consumes on the secondary side of the ballast.
Tried that,........
And the end result was.............?
There will be more information than that if you dig deep enough.150HPS-150 watt high pressure sodium 120/208/240/277 volt ballast. Use medium base, ED-17 lamp.
And, don't forget to cap those other voltage taps. Each puts out its labeled voltage when any one is supplied at its voltage. The primary is an auto-transformer.