One of my textbooks for Chinese contains a lesson entitled "拍照". The lesson contains an exercise with questions that need to be answered using vocabulary and constructions from the lesson. The last question is:
你拍照片儿的时候怎样用光?
The lesson's vocabulary lists contains words such as 光线 and 闪光灯,but not 用光, which MDBG translates as "out of (supply) / spent / exhausted (used up) / depleted". MDBG's translation does not make sense to me in this context. So what does the sentence mean? “How do you use the light when making photos?”