The Windows tool 'Negative Screen' manipulates screen colors, either changing or fully inverting them,
which can be a life-saver (or should I say eye-saver) for screen work.

I created a few blue light reduction / screen dimming color matrixes.

# Paste these into negativescreen.conf

# Neutral veiled 60% brightness dim 
# For working in dark environments
Liqube Dim=win+alt+F12
{  0.4,  0.0,  0.0,  1.0,  0.0 }
{  0.0,  0.4,  0.0,  1.0,  0.0 }
{  0.0,  0.0,  0.4,  1.0,  0.0 }
{  0.0,  0.0,  0.0,  0.0,  0.0 }
{  0.1,  0.1,  0.1,  1.0,  0.0 }

# Neutral veiled 80% brightness dim 
# For working in very dark environments
Liqube Dim Eighty=
{  0.2,  0.0,  0.0,  1.0,  0.0 }
{  0.0,  0.2,  0.0,  1.0,  0.0 }
{  0.0,  0.0,  0.2,  1.0,  0.0 }
{  0.0,  0.0,  0.0,  0.0,  0.0 }
{  0.1,  0.1,  0.1,  1.0,  0.0 }

# Neutral veiled 20% brightness dim 
# To take the edge off the contrast
Liqube Dim Twenty =
{  0.8,  0.0,  0.0,  1.0,  0.0 }
{  0.0,  0.8,  0.0,  1.0,  0.0 }
{  0.0,  0.0,  0.8,  1.0,  0.0 }
{  0.0,  0.0,  0.0,  0.0,  0.0 }
{  0.1,  0.1,  0.1,  1.0,  0.0 }

# Like Liqube Dim, but with blue light reduction 
Liqube Warm Dim=
{  0.4,  0.0,  0.0,  1.0,  0.0 }
{  0.0,  0.25,  0.0,  1.0,  0.0 }
{  0.0,  0.0,  0.25,  1.0,  0.0 }
{  0.0,  0.0,  0.0,  0.0,  0.0 }
{  0.1,  0.1,  0.1,  1.0,  0.0 }

# Like Liqube Dim Eighty, but with blue light reduction 
Liqube Warm Dim Eighty=
{  0.2,  0.0,  0.0,  1.0,  0.0 }
{  0.0,  0.1,  0.0,  1.0,  0.0 }
{  0.0,  0.0,  0.1,  1.0,  0.0 }
{  0.0,  0.0,  0.0,  0.0,  0.0 }
{  0.1,  0.1,  0.1,  1.0,  0.0 }

# Warm desaturation, blue lighr removal, no inversion 
# For working before bed time
Liqube Warm=
{  0.5,   0.0,   0.0,  0.5,   0.0 }
{  0.4,   0.4,   0.4,  0.5,   0.0 }
{  0.25,  0.25,  0.2,  0.25,  0.0 }
{  0.1,   0.0,   0.0,  0.3,   0.0 }
{  0.0,   0.0,   0.0,  0.0,   0.0 }

# Experimental deep red 
Liqube Red October=
{  0.50,  0.00,  0.00,  0.50,  0.00 }
{  0.40,  0.40,  0.40,  0.50,  0.00 }
{  -0.25,  -0.25,  -0.25,  0.25,  0.00 }
{  0.00,  0.00,  0.00,  0.80,  0.00 }
{  0.10,  0.10,  0.10,  0.10,  0.00 }