For what is worth I have have been using Patrols for the fast 18 years and found my spots only lasted a couple of years as they used to snap off on the mount through metal fatigue. I used KC's , CIBIE's and one other make and they all snapped off going off road after awhile ....... I then was recommend Lightforce (from Australia) they are in a different league.
Made of Poly carb ..... super light and no fatigue and when I last looked a few years back on their website they shot the lights with a 12 guage shotgun from about 20 meters and they still worked!!
What is really nice about these lights is they come with a clear filter so you dont have to replace the light because of stone damage and you can fit fog light filters to the light and night game viewing lens
These have been on my second Patrol for the past 8 years and are still perfect condition
......... They have a seperate switch on/off but are connnected in parallel to my brights.