The mage can brighten or weaken an existing light source, such that a 40-watt light bulb can be made to shine as brightly as a floodlight.
Each success doubles the light’s candescence or diminishes it by half.
Guardians of the Veil Rote: Dim the Lights
The Guardians of the Veil use this rote to darken the places they sneak into without affecting any existing systems, which could be centrally monitored.