In some kind of .cfg file i'm guessing.
maybe not. the guy who posted that dx10 video thats the first search on youtue for 'crysis' uses these lighting settings in the sandbox for the map he created
Relevant Settings Value
HDR dynamic power factor 1.71418
Sky brightening (terrain occlusion) 0.842513
SSAO amount multiplier 2.5
Sun color 235 / 190/ 122
Sun color multiplier 16
Sun specular multiplier 1.88571
Sky color 100,139,241
Sky color multiplier 0.5
Fog color 151 /194 / 233
Fog color multiplier 8.23017
Volumetric fog: Global density 0.2
Atmosphere height 29791.2
Volumetric fog: Density offset 0.01
Sky light: Sun intensity 255,255,255
Sky light: Sun intensity multiplier 0.00270176
Sky light: Mie scattering 571391
Sky light: Rayleigh scattering 0.902763
Sky light: Sun anisotropy factor 0.999464
Sky light: Wavelength R 734.263
Sky light: Wavelength (G) 602.222
Sky light: Wavelength (B) 523.79
Sun shafts visibility 1
Sun rays visibility 10
Sun rays attenuation 0.5
Color: saturation 1
Color: contrast 1
Color: brightness 1
Levels: gamma 1
EyeAdaption: Clamp 4
Dof: focus range 1000
Dof: blur amount 0