I Just Buy a Welthink Ballast, brand new from a Electrical Distributor in montreal.
It s the WEX120-400 It does 120/240 and MH/HPS
Time Will Tell...
*******EDIT*****
After 12 hour, the ballast is not comming hot.....
no interference.....
I Paid 115$ CASH for a 400 watt ballast and the 400...