Meaning of 用光 in context of photography 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?”
&quot;用光&quot; always means use and exhaust something. It is inappropriate to use that verb in photography, no matter it is HK, Taiwan or China, nobody use that word for photography or film making.
Mandarin has a special jargon for taking flash/lighting adjustment .

打光  or   打光线  or 用闪光灯

In case of &quot;make use of light&quot;. Without flash, mean make use of natural light for composition.

运用光线 / 运用光线构图

for metering

测光

In filming and photo shooting , when you run out of battery or memory storage/ film

用光电池 / 用光记忆卡/用光菲林

So you can see it is bad attempt to associate  用光 with the use/preparation of light.
Imagine the camera man told the director, &quot;Too dim, need more light&quot;

太暗了， 需要用光 &lt;-- The director will ask what the cameraman need due to  (battery, film, data storage) exhaust/deplete/used up, or perhaps get a smack.
太暗了， 需要打光 &lt;== this is something everyone understand clearly