I could use a light snack, I suppose.
Please turn off the light when you leave the room.
The light was on in my room.
"The light was on" is a complete sentence. "On" is the adjective.
"Building of steel ships are light and strong" isn't a grammatically correct sentence. A better sentence is "The building of steel ships that are light and strong is crucial".
"light" is a noun. "as you drew near the light" is not a sentence, though. It's a dependent clause.
A asteroid travels at the speed of light.
We will need a torch to light our way.
This sentence is present tense
light energy is a source that comes from the electricity
The light is so bright in the morning.
A light-year is a measure of distance, not of time.
at
"Kal" means "easy", "simple" or "light" (light-weighed), depends on the sentence.