I have mounted 3 inexpensive 14.5" LED Spot light bars and 2 Rear Flood LED's to my roof rack.
Front
From Superbrightleds.com , 5400 Lumens each. I have had these for over 5 years and they are great. As of this posting they are only 100 US Dollars.
Link to site page.
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Here in the Arizona sun the shells have chalked up a bit, but functionally not an issue. I bang low hanging limbs with these all the time.
Back of lights showing sun fade on shell.
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Rear
From Superbrightleds.com , a little over 2000 Lumens each. Selling for 50 US Dollars.
Link to site page.
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Since my roof rack is nearly all tubing, I use these PIAA 74000 7/8"-1.25" L-Brackets. Found them to be very strong and versatile, allowing me to mount to the outside Light Bars at an angle.
Here is a link to the current Amazon listing for these. The ones selling now are a little more expensive than when I bought them and they have added a second mount hole to the swivel leg.
A close up of the mount in use.
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I have wired the switches for all 5 of these lights to have a power source from IGN ON circuit, or when toggled, from my house battery. I will be adding Reverse Gear trigger to the rear floods.
Due to the desert heat, we end up on the trails at night quite often. These lights make finding side trails and seeing a good path in front me, really easy. I am usually pulling a trailer with two quads on it. Those rear floods are aimed down the side of the trailer to help with backing up at night. Good for camp setup too, but at some point I want to mount the rear floods onto extendable poles instead of the roof rack. Hoping to make them even more useful within camp.
randy