mine do that.
when i turn them on they flash bright and then once they warm up they reach their specific color and brightens
So got me my Xenonvision 5k HID kit from Advancespeedshop about 2 months ago with the battery wiring harness and now i notice that they dim after about 40-50 seconds from turning them on.Is this normal?
When you turn it on, its suppose to be at its brightest and as it slowly warms, it gets slightly dimmer and gets to its temperature of whatever your lights are (4300k, etc.) as mentioned above.So this is how it goes.I turn on light switch,flashes then it slowly brightens up.It is probably at it's brightest at around 20 seconds after i turn it on but after 40-50 seconds it flickers on both sides and then dims after the flicker.I will take a pic of how i got it wired up later on today as it's already 1:00 A.M. right now.