HighlightNormalLowlight ILowlight IILowlight IIILowlight IVTherm
Overbright+1+2+2+3+4+4+2*
Well Lit000+2+3+30
Moderate Light+3+2+10+1+2+1
Dim Light+5+4+3+200+1
Minimal Light+7+6+5+4+20+2
Full Darkness+8+8+8+8+8+8+2
Mist+1+2+2+1000
Light Smoke/Fog/Rain+5+4+4+3+2+10
Heavy Smoke/Fog/Rain+7+6+6+5+4+30
Light Smokescreen+5+4+4+3+2+1+4
Heavy Smokescreen+7+6+6+5+4+3+6
Glare+2+2+2+2+2+2+2*

* Therm vision suffers glare and overbrightness from strong heat sources instead; for glare and overbrightness, the worst modifier is used.