Shortening them isn't going to hurt. Just try not to damage the thread too much if you don't have a nut to run over the thread after cutting.
I'd also look at getting some Loctite thread lock glue as well. A medium strengh glue will be tight enough to stop thieves in a hurry but should allow you to undo them later on if you want to adjust or remove the light.
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Cheers,
Jamie
MY15 WK2 GC Limited 3.0L. Ironman lift, bullbar & winch. Uneek rack & sliders
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