Cree LED Light Bar

I just got a Cree 126 w LED Light Bar , mounted it on antenna brackets , going to run the wires to the battery with a fuse and a heavy duty switch , don’t want to use a relay as that would be something else to get wet ————-I got two questions , 1 ) I have had a couple of people I know that ride a lot at night and in water and they both took the cover off their new lights and siliconed the cover , both said if you don’t do it the light will flood out ????? if you do it , it will kill the 2 year warranty , but for $36.50 I probably wouldn’t send it back any way and they might not cover water damage 2) I need to put a 1/4 38 and inch spacer under the mounting bracket so it will pivot further down and not hit the bar , would you put a solid spacer of steel or plastic ( something solid ) or maybe rubber which maybe absorbs some of the bounce , but then again it my bounce more with rubber

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