low-pressure sodium lamp การใช้

• Reference ballasts - high - intensity - discharge and low - pressure sodium lamps
• Ballasts - for high - intensity - discharge and low - pressure sodium lamps multiple - supply type
• High - intensity - discharge and low - pressure sodium lamps , ballasts and transformers - definitions
• Roadway lighting equipment - high - intensity - discharge and low - pressure sodium lamps in luminaires - field identification
• Electric lamp ballasts - high - intensity - discharge and low - pressure sodium lamps , ballasts and transformers - definitions