Light radius
Light radius is a modifier which affects the maximum radius you can see clearly in low Light Level areas. Your light radius is further reduced by your current percentage of maximum life. This makes it very difficult to see in dark areas when on Low Life. The Arcane Vision passive and Incandescent Heart changes your light radius to be based off your proportion of Energy Shield instead of life, aiding visibility for low life builds.
Passives
Related passives: Template:Passive table