evocation light 

Traditions arcane, divine, occult, primal

Cast [>>>] material, somatic, verbal; Cost 6 gp of ruby dust

Range touch; Targets 1 object

Duration unlimited

A magical flame springs up from the object, as bright as a torch.

It doesn't need oxygen, react to water, or generate heat.

Heightened (+1) The cost increases as follows: 16 gp for 3rd level; 30 gp for 4th, 60 gp for 5th, 120 gp for 6th,; 270 gp for 7th, 540 gp for 8th, 1,350 gp for 9th, and 3,350 gp for 10th.

Core Rulebook, page 326.