Light
From LSWiki
[Spell :] Light [Level :] One [Reversible :] Yes [Sphere :] Conjuring [Components :] None [Usage :] cast light [-] [Effect :] Casting light brings forth a magickal light to illuminate the caster's way. Casting the reverse, dark, will banish a magickal light if one is summoned, otherwise it will summon a magickal darkness.