Nedco Stocks Replacement Ballasts and Coils
I upgraded my 175w ballasts to 250w ballasts by replacing the transformers and coils inside the ballast boxes with units I bought from Nedco in Vancouver. They have Vancouver, Burnaby and Richmond outlets. You can match up the ballast and coils you need using the ANSI chart under the Canreef lighting forum, eg M59 transformer and coil for Hamilton 400w.
To hook up the new transformers and coils, just connect up the wires the same way the old ones were. The color coded wires are consistent from unit to unit. It is pretty easy to do.
The upgrade cost me $80/unit and took me about 1 hour.
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