Ok, maybe this isnt exactly what you need, but I have found this in HL SDK.Don't know if this somehow helps or no.
Code:
// 0 normal
LIGHT_STYLE(0, "m");
// 1 FLICKER (first variety)
LIGHT_STYLE(1, "mmnmmommommnonmmonqnmmo");
// 2 SLOW STRONG PULSE
LIGHT_STYLE(2, "abcdefghijklmnopqrstuvwxyzyxwvutsrqponmlkjihgfedcba");
// 3 CANDLE (first variety)
LIGHT_STYLE(3, "mmmmmaaaaammmmmaaaaaabcdefgabcdefg");
// 4 FAST STROBE
LIGHT_STYLE(4, "mamamamamama");
// 5 GENTLE PULSE 1
LIGHT_STYLE(5,"jklmnopqrstuvwxyzyxwvutsrqponmlkj");
// 6 FLICKER (second variety)
LIGHT_STYLE(6, "nmonqnmomnmomomno");
// 7 CANDLE (second variety)
LIGHT_STYLE(7, "mmmaaaabcdefgmmmmaaaammmaamm");
// 8 CANDLE (third variety)
LIGHT_STYLE(8, "mmmaaammmaaammmabcdefaaaammmmabcdefmmmaaaa");
// 9 SLOW STROBE (fourth variety)
LIGHT_STYLE(9, "aaaaaaaazzzzzzzz");
// 10 FLUORESCENT FLICKER
LIGHT_STYLE(10, "mmamammmmammamamaaamammma");
// 11 SLOW PULSE NOT FADE TO BLACK
LIGHT_STYLE(11, "abcdefghijklmnopqrrqponmlkjihgfedcba");
// 12 UNDERWATER LIGHT MUTATION
// this light only distorts the lightmap - no contribution
// is made to the brightness of affected surfaces
LIGHT_STYLE(12, "mmnnmmnnnmmnn");
// styles 32-62 are assigned by the light program for switchable lights
// 63 testing
LIGHT_STYLE(63, "a");
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