I don't think you can make a categorical ruling about the visibility table. Like if there was a swamp covered by dense trees that blocked the sun, you could have partial light and mist. And if someone dropped a flash pack in total darkness, you'd bet it would add the glare modifier -- now it's too dark to see AND you're especially susceptible to glare, so you're more blinded than before. Keep in mind that -6 for total darkness is not "totally blind." It's just a -6. If you have better than 6 perception dice, you will still be able to spot at least some things even in total darkness. You're not as blind as you could possibly get until you're at 0 perception dice. Now, obviously there are ones that wouldn't stack, like total darkness and partial light, or heavy smoke and light smoke. Those are kind of duh. But I think in some circumstances vision modifiers should stack, the GM just has to decide if it makes sense or not.

And I really don't get where you're coming from with "Tables generally mean only one is applicable at a time." There's a table right above the one you're referring (the ranged attack modifier table) where all the modifiers could stack at once. In fact, I'd argue that tables generally can stack all together. The range table is one of the few exceptions that provides mods that can never be added together.

So, if I have a sam who when he sees a very hard shot decides to trust his gut instead and closes his eyes, thats metagaming?

So, if I have a sam who when he sees a very hard shot decides to trust his gut instead and closes his eyes, thats metagaming?

I told everyone not to worry at all about resources. I will provide them (and they will be light at first) The reason I thought about doing it this way is because:

Tables generally mean only one is applicable at a time.

This is just another example of the type of absolute bullshit you have been spouting lately.

This is just another example of the type of absolute bullshit you have been spouting lately.

Don't forget that you're almost never in ideal conditions in combat. My players are on the verge of assaulting a relatively intact house in Redmond. It's dark (it's the barrens at night) and drizzling (it's Seattle, duh). The current visibility modifiers are -8 for natural vision, -7 for low-light, -3 for thermographic, and -4 for ultrasound.

-8! My shooting dice pool is 6 dice. Yikes!
So what did I do? Did I argue what modifiers make sense and spend minutes pointing at ables and beating Aaron about the head?
No.
I turned on the car head lights on high and then fired my shot at the well lit illuminated silhouetted target. 13 DV -3 AP hurts.