Corpselight

You cause a body, either dead or undead, to give off a faint radiance, from a thin nimbus outline to a full torch-like aura. The color of the glow can be specified as part of the verbal component as being white, yellow, green, amber, or red. The brightness is adjustable by the caster as long as he or she is within 30' of the body. The glow is spread out evenly over the corpse and does not flicker. This emanation is not harmful to the body. The surface area of the body or bodies is a limiting factor in how many bodies can be affected—many dead rats could be set aglow, or a couple of halfling zombies, or one elvish skeleton, for example. The spell ends if you dismiss it as an action.

Only corporeal undead can be the target of this spell.