Yes, the sentence is grammatically correct and also makes sense. I only have one comment for you: This is a very passive sentence. It is definitely not the way an American English speaker would speak. Americans also try not to write passively, unless there is a particular reason. We would tend to SPEAK sentences like..."I need to replace that light bulb so I can see better in this room." OR "The last light bulb just went out. Now it's completely dark in this room." If an American were to WRITE this sentence, we may write the following: "We use light bulbs to provide light to dark areas so we can see."

It actually isn't OK because it is unusual. Flashlights are used to see in the dark. Night-vision googles are used to see in the dark. Light bulbs are a help to us in almost every facet of life where there is little or no light. Light bulbs are used to light up a room. I would never use your sentence in any situation because it sounds unnatural.