50 Watt S68 High Pressure Sodium 120V Ballast Kit No USPS 500 and Mean Lumens of

500 and Mean Lumens of 8

000 Lumens Means Lumens 24

300 Lumens Lumen Efficacy 125 Lumens Per Watt ANSI Type S51 Bulb Shape T14

Advance Ballast 71A7971-001D

50 Watt S68 High Pressure Sodium 120V Ballast Kit No USPS 500 and Mean Lumens ofHPS Ballast Cross Reference: Advance Ballast 71A7807 Sylvania Ballast LU50 120R Keystone HPS 50R 1 KIT MagneTek 1233 35U Venture V90B1120 High Intensity Discharge (HID) lamps require a ballast to apply starting voltage to the lamp and establish current flow an arc between the lamp electrodes. Without a ballast, the arc will extinguish or draw increasing current until some circuit element burns up. Ballasts provide system stability by limiting the