暗いところで

in the dark

→ 暗い
phrase Rare #29,189
in the dark 暗いところ means “a dark place,” and で marks the place where an action or state occurs. 所 can also be written instead of ところ.
JA: 暗いところでスマホを使うと、目が疲れます。
EN: If you use your phone in the dark, your eyes get tired.

暗いところでオモチャ銃が本物に見えた

In the dark, the toy gun looked real.

— ダイ・ハード (1988)

暗いところで本を読んではいけません

You must not read books in the dark.

目に悪いから暗いところで本を読んではいけない

You shouldn't read in dim light because it's bad for your eyes.