A cheap, easy way to give you peace of mind on this is to create a radiant barrier. I was thinking, rolled aluminum from your local box store for roof flashing?
(simple explanation for others, if you sit in front of a camp fire, your front is warm, your back is cool. If you place an object or person between you and the fire, you will have a radiant barrier, and they steel your heat
)Set in place between the muffler and the back of the lights (without touching either). This piece could even be painted with a rubber under coating on the cold side (insulation, poor conductor of heat).
You could bend the edges in a vice, drill some holes, use rivets or bolts to attach it to the hood or inner brackets. If you wanted a clean outer look, use JBWeld after putting sufficient scuffs in the bracket edges and inside hood.
Just a thought, I see many ways to get it done, and I too, would be concerned about the heat on LED's also, your muffler looks to be close to the front of the hood, but the lights would really stand out with a personal touch.
Cheers,
