Bought these with HYB 55w ballasts. Works fine in this config. They are also advertised as 35w and have been tried on several other 35w AC ballasts and die within seconds. Color temperature 6K stitching accurate at 55W. If you had a ballast that could drive them at 35w they would probably be closer to 8K. Not necessarily blue but a bit cool for my taste and no real difference in light output compared to the 35w setup that I already had I think I'll keep them as a backup, but not recommended in general. The H7s I have only have loose spade lugs while my previous pair had them in a real socket so that's a bit cheap too.
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