Light Sources include, jewelry, armours, as well as handheld objects, or even prayers/spells.

(See also, Light, Darkness, and finally Darkness Sources)

Jewelry:
>Silver rings:
off of Curano in Vesla
off of Alchemist in Indel
>Bone Ring:
chance to drop off of a skeleton in Vesla Graveyard
>Sun rings:
off of the munchkin mage in the wilderness near Exedoria
>Amulet of Fire:
from the high monk of fire in Candera

Armour:
>Bright Tunics:
located somewhere in Exedoria

Handheld Objects:
>Torches, Lanterns, etc...:
They can be purchased from merchants in just about every city, and can also be bought off peddlers wandering around in Vesla Tiki torches can also be purchased.  The main advantage of tiki torch is that is can provide light while not being wielded.

> An Enchanter, located in the Anshelm Business District, will <glow> items in your inventory, for a fee.

Prayers/Spells:
>Light spell by Mages
>Light spell by Clerics