Light
Light (brightness)
What lets us see, from the sun or a lamp.
Open the curtains and let the light in.
Light (pale)
Pale in colour; not dark.
Meera painted her room light blue.
Light (set burning)
To make something start to burn or shine.
Grandmother lights the lamps on the evening of Diwali.
Remember: All three are about brightness: the light itself, a colour with more light in it, and making a lamp give light.