Have the Hengs vent in our 2016, but back then, it did not have an led bulb. Have since installed one, pretty good light, but not like an overhead. Is it a "wedge" base bulb, type that pushes straight in to a plastic slotted socket?? If so, your overhead or under-cabinet lights may or will be the same base, and you could double check the vent bulb in one of the other lights to see if all leds are operating.
If same hood still, but with led, the plastic lens not very clear, frosted some, and may be the problem. You could also find out the specs on the bulb and find another brighter one to replace it.
'16 Outdoors Timber Ridge 280RKS
Reese 1700# Trunnion w/ DualCam HP
'03 EXCURSION XLT V10 4.30 Axles