Light cantrip and its uses.

[Corvax]

How do I cast the light cantrip on a equipped item like a weapon. And why do it not last until long rest?

[Rez Elwin]

Casting on you or an ally should make their weapon glow. They kept to the 5e rules where the spell lasts 1 hour, or 10 turns.

It will be very useful in the Underdark.