Working in the dark

CSI, (the original one, not the Miami or NY variety), is one of my favorite shows. They have great characters, interesting stories, and some really cool science.

Something that I have noticed recently about CSI is that these people love to work in the dark. If you watch the show, you know that the story is based around the night shift CSI crew. Most of their work is done at night.

That still doesn't explain this:
While this guy performs an autopsy, he uses one small fluorescent light. He puts that light in the corner and puts a sheet over it. Yeah, that just seems to bring out the details in a dead body.
There is never a fully lit office or workspace. Here's a guy doing some DNA tests. Very sensitive and careful testing, where every detail matters. Turn the lights off before you start.

So, the lab guys like to work in the dark. What about the CSI team themselves? Out at the scene. How do they work?
You got it, in the dark. Go into the house where someone was murdered and start looking for the evidence. Don't turn the lights on. That little pocket flashlight, that runs off of two AA batteries will do it. Looking for that smallest hair in the carpet? How about reading that fake suicide letter? Do it in the dark, if you are going to do it at all.

There are times when the lights need to be out so they can use their fancy equipment and lasers. But there are several times in each episode, I just sit and ask myself, "Why didn't they turn the lights on?"