Light

Effect
Increasing Light level doesn't affect the focus cost.

Sun Attunement affects the duration.

Stacking and charging glyphs improve the focus cost and duration.

Description
"A dim spark flashed at his fingertips and an iridescent bubble suddenly floated at the man’s shoulder, partially illuminating his face."

External Reference

 * Magic, Combat, and Crafting Skills on the Shroud of the Avatar Forums