Gl flashblend
From FTE
Name: gl_flashblend
Default value: "0"
Flags:
0 = Use proper lighting for light sources (powerups etc.).
1 = Just draw a shaded ball of the color of the light.
2 = Just draw a shaded ball, but only if the center is visible, and draw the outside through walls.
gl_flashblend controls the way dynamic lights are drawn. Dynamic lights are eighter rendered as lightmaps gl_flashblend = 0 (slower but realistic) or as translucent shere gl_flashblend = 1 (fast, doesn't require lightmap update)