why is it always so dark in las vegas???

i do not know if you are a fan of csi: las vegas, but i am for sure (grissom, if you're reading this, call me!!!xoxo) and for as many episodes as i've seen (and re-seen) i can never seem to get over the fact that it is almost always entirely dark in every scene. in the miami version, it's always orange. in the new york version, everything is blue-r than it should be. but in vegas, these people are constantly investigating crime scenes in the pitch black darkness of someone's house or some field in the middle of nowhere with their flashlights and i have to wonder if the sun just doesn't come up in vegas or what? even when they are inside and it's dark, they walk around with their flashlights, when - hello - why don't you just turn on the LIGHTS?? and still, in the complete darkness, they can manage to find a hair under a car seat, or a fingernail clipping buried in shag carpet. it's quite infuriating when you think about it, especially when you consider that in most episodes, they get all the evidence, get dna results back, and put the guilty party in jail (and by the way, i do not know much about the way the judicial system or whathaveyou works, but i'm pretty sure that crime scene investigators do not find the evidence, question the suspect, and then make arrests. there are like 3 sets of people who do that - do they not watch law & order??), one neat little hour long package for our viewing pleasure. granted, none of this is as infuriating as the fact that horatio on the miami version NEVER looks at anyone when he's talking to them, but that's beside the point. my point here is: 1. turn the freakin lights on and 2. we may be fat couch potatoes but we are not stupid so don't think i don't realise that you don't find a body and solve the crime all in one day. except that gil grissom is the smartest person alive so i guess he can do whatever he wants. i'll still watch it.