CSI and other shows like it .. Why don't the investigators EVER turn on the lights?

Question

You always see them in a darkened room with flashlights at a crime scene... they NEVER turn on the lights.. what's up with that?

Answer 1

HAHAHAHA

I say that all the time and my mum always laughs at me.

I have two guesses:

Most likely, dramatic effect.

More realistic, it's easier to see little things with pinpointed beams.  

Answer 2

I have wondered the same thing many times.

It seems to me that it would be a lot easier to find clues with a light on!!!  Don't you Think?

Come on! Turn on the lights!

Jeff: You've just made my day LOL

Answer 3

Didn't you hear? David Caruso has Eosophobia, the fear of light. Why else would someone be so obsessed with putting his sunglasses on?

And besides, if they were to turn the lights on how would anyone see their futuristic-looking green laser beams and flashlight rays?