Electric light
From Kerbal Space Program Wiki
Lights are parts that use electricity to shine a light, they can be used to help with landing planes at night or help landing command pods at a dark side of a tidally locked moon like Ike or Vall. Currently, there are only three light sources. The Illuminator Mk1 and Illuminator Mk2 are the only light available while the Small Gear Bay also holds a lightsource.
