New LVD Brand (Shanghai, China) 200 Volt to 240 Volt Input, 40 Watt / 500 Volt Output, Induction Lamp Ballasts for Grow Lights and Other Lighting Applications, Part Number LVD-WJ220/50-40DJF.  Each bid quantity is for One (1) Ballast.  You may bid / buy any number, up to the total quantity available above.

These were purchased at a lost freight sale earlier this year, and they were brand new in the original factory boxes.  We don't know a lot about induction lights, or how they are wired.  Therefore, any advice we give would be useless at best, and dangerous at worst.