[LIGHTS]
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landing
light.0 = 3,  -6.60, -19.29,  0.79, fx_navred ,
light.1 = 3,  -6.60,  19.29,  0.79, fx_navgre ,
light.2 = 3, -25.33,   0.00,  0.72, fx_navwhi ,
light.3 = 2,  -6.43, -19.29,  0.79, fx_strobe ,


Those are the first four lines of the Beach baron 58 (stock  FS9) to start every section you need the [LIGHTS]that tells the computer that it needs to read the following lines for light bulbs

then the next line or in the following lines you need to add Light.0 (zero) that's the start of the first light,

after that add a corresponding number 1=beacon, 2=strobe, 3=navigation, 4=cockpit

that is so when you hit the strobe light toggle on the panel the strobe lights turn on and not the landing lights 

the next three numbers: x, y, z are

x for / aft

y port / starboard

z up /down

and for the end FX_a_light_type

any FX_ in you library can be entered here, do not add the .fx part, eg FX_navred.fx



Hope this helps a little