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How to use LIGHTS.INI:
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[LIGHTS] section
++++++++++++++++
The [LIGHTS] section lists all the dynamic lights definitions.
Example:
Nb= 52							<-- There are 52 lights definitions in the section
LIGHT1= 0.0 0.4 1.0 0.0 0.6		<-- Parameters are Red Green Blue Radius
LIGHT2= 1.0 0.9 0.1 1.0
LIGHT3= 1.0 0.9 0.1 +1.0		<-- The + before the radius means that the current radius of the light will be increased by one unit.
LIGHT4= 1.0 0.9 0.1 -0.7		<-- The - before the radius means that the current radius of the light will be decreased by 0.8 unit.
...
LIGHT13= 1.0 0.9 0.1 +2.2
LIGHT14= 1.0 0.9 0.1 -1.2
LIGHT15= 1.0 0.9 0.1 -0.8

Red, green & blue parameter are between 0.0 (dark) & 1.0 (bright).
...

[LIGHTING] section
++++++++++++++++++
This section lists ALL the states present in the game.
If you know C language see the "state_t states[NUMSTATES]" table in info.c of the Doom/heretic/Hexen sources.
You CAN'T delete any line of this section, nor switching them.

You can attach any previously defined light to any state.

Example:
S_ROCKET= LIGHT1
...
S_EXPLODE1= LIGHT13
S_EXPLODE2= LIGHT14
S_EXPLODE3= LIGHT15

When you will launch a rocket, a light (r=1.0, g=0.9, b=0.1, radius= 1.0) will be spawned.
When this rocket will explode, its light radius will be increased by 2.2 units the decreased by 1.2 and 0.8 units.