nightlight

noun2

1. •
   A small, dim light or lamp left on overnight.

   • He put a small nightlight in the bathroom to find his way around in the dark.
2. •
   Light that shines at night, such as moonlight or starlight.

   • The floor-cloth deadened his footsteps as he moved in that direction through the obscurity, which was broken only by the faintest reflected night-light from without. — 1895