Ok after more research I have come up with some answers. Here is some of what I found at the link I posted above.
LEGAL HOURS for hunting are 30 minutes
before sunrise until 30 minutes after sunset,
except that alligators, raccoons, opossums,
foxes, coyotes, bobcats and feral hogs may
be hunted at night. However, only battery
powered lights not exceeding 6 volts (12 volts
for alligators) or fuel type lanterns may be
carried by hunters for locating these animals.
So you can hunt feral hogs at night.
FERAL HOG
PRIVATE LANDS: No closed season; no
limit. No hunting over bait, from a vehicle, or at
night with a light over 6 volts except by special
permit. A resident Hunting License is required
to hunt feral hogs for all resident hunters 16
years old or older, except when hunting on
land owned by them or their immediate family
(blood or dependent relationship) residing
in the same household. Non-residents must
meet non-resident license requirements.
NATIONAL FOREST LANDS (outside of
WMAs): Hogs may be taken with archery
equipment during archery deer season,
with deer firearms during firearms deer
season, with turkey firearms during turkey
season and with small game firearms during
small game season from Aug. 15-Feb. 28.
Pursuing, catching or hunting hogs with dogs
is prohibited during firearms deer season.
No limit. No night hunting. Hunting license
requirements must be met. Hunter orange
is required during firearms and primitive
weapons deer seasons.
So in my opinion, from what I have read and posted above, you are legal to hunt feral hogs at night with the crossbow as long as the light is not over 6 volts, unless you have a special permit.
But it is always a good thing to double check with the local MNR or DNR on questions like this.
Good luck.