GarrysMod\garrysmod\data\snfl - Here is stored all presets
My presets:
default_gmod.json
[15.0,299.0,0.4399999976158142,0.15000000596046449,0.0,1.0,1.0,255.0,255.0,255.0,"sprites/glow04_noz sprites/blueflare1_noz_gmod sprites/orangecore1_gmod sprites/light_ignorez","0 0 0 90","1 1 1 2"]
default_snfl.json
[18.0,235.0,0.5,0.15000000596046449,1.0,1.0,1.0,255.0,255.0,255.0,"effects/snfl/fx_flare1 effects/snfl/fx_flare2 effects/snfl/fx_flare3 effects/snfl/rainbow","0 0 0 105","1 1 1 2"]