present participle of illuminate.
"The sudden flash from her camera was illuminating the dark alley just enough to spot the stray cat hiding in a box."
tending to increase knowledge or dissipate ignorance
"an enlightening glimpse of government in action"
"an illuminating lecture"
Providing illumination or light.
"The lantern cast an illuminating glow over the dark alley, allowing us to see our way home safely."