I tried the Kensun and was not happy with them at all. Their ballasts made a high pitch whine sound and the bulbs almost melted. I returned them immediately and bit the bullet and went with Xenondepot's brand. Never a problem and had them in for some time now. I also went with LED fog lights.
I have heard this before about the whine !
Did you have 55W or 35W ?
I have 35W and was told only the 55w does this but do not know if this is true or not
