The transformer regulates the electrical supply for sodium vapor lamps, which require high starting voltage and controlled operating current. It steps up or steps down the input voltage and ensures a stable current to maintain the lamp’s brightness and prolong its life.Sodium vapor lamps are a type of gas discharge lamp where the light is produced by an electric current passing through vaporized sodium. When the current ionizes the sodium gas, it emits light, predominantly in the yellow spectrum, making it ideal for outdoor lighting applications.