PoliceDev

True, but did you read what I wrote, this. Its not that what he was talking about that will seq that will destroy your code.
Another words I am saying you can completely remove all inputs and create your own light pattern at different speeds. Maybe someone discovered carcols.ymt great for them and helping the community.
 
However I am bringing in a whole new way to do lights like the original coders of Rockstar. 
No one has discovered, that you can actually delete lines and make your own sequence.
 
 
rotation light
<Item>
          <rotation>
            <delta value="0.00000000"/>
            <start value="5.75958600"/>
            <speed value="0.00000000"/>
            <sequencer value="4294967295"/>  -------do not touch this will break games
            <multiples value="1"/>
            <direction value="true"/>   this create glow on wall
            <syncToBpm value="true"/>
          </rotation>
          <flashiness>
            <delta value="0.00000000"/>
            <start value="5.75958600"/>  -----glow start
            <speed value="120.90000000"/>   ----change this for speed
            <sequencer value="4294967295"/>
            <multiples value="4"/>
            <direction value="false"/>
            <sequencerBpm value="15"/>
          </flashiness>
          <corona>
            <intensity value="90.00000000"/>     -----intensity of glow
            <size value="1.10000000"/> ---size of bulb
            <pull value="0.00000000"/>
            <faceCamera value="false"/>
          </corona>
          <color value="0xFFFFFF"/> --website link
          <intensity value="2.00000000"/>     off value
          <lightGroup value="1"/>
          <rotate value="true"/> --- make rotator or flasher
          <scale value="false"/>
          <scaleFactor value="0"/>
          <flash value="false"/>
          <light value="true"/>  ---do you want light or just a spinning object
          <spotLight value="true"/>
          <castShadows value="false"/> ----make shadow show up however gpu intensive.
        </Item>
 
this is a flash bulb
<Item>
          <rotation>
            <delta value="0.39269900"/>
            <start value="0.00000000"/>
            <speed value="1.00000000"/>
            <sequencer value="0"/>
            <multiples value="1"/>
            <direction value="false"/>
            <syncToBpm value="false"/>
          </rotation>
          <flashiness>
            <delta value="0.00000000"/>
            <start value="1.14159300"/>
            <speed value="60.00000000"/>
            <sequencer value="2863311530"/>
            <multiples value="4"/>
            <direction value="false"/>
            <syncToBpm value="true"/>
          </flashiness>
          <corona>
            <intensity value="10.00000000"/>
            <size value="1.50000000"/>
            <pull value="0.10000000"/>
            <faceCamera value="true"/>
          </corona>
          <color value="0x3333FF"/>
          <intensity value="1.00000000"/>
          <lightGroup value="0"/>
          <rotate value="false"/>
          <scale value="true"/>
          <scaleFactor value="2"/>
          <flash value="true"/>
          <light value="false"/>
          <spotLight value="true"/>
          <castShadows value="false"/>
        </Item>

Ok lets say the you created a custom made input erased all input for flashes and rotators. The sequence is from 1 to whatever meaning headlights is 1 if you have tail lights that is 2, still researching this, but maybe each headlight represents a single input is 1 and 2 anyways. Its the the pattern what fires off first example     sequence     123456     headlight1  then headlight2 tail light and tail light then siren 1 and siren 2, has been working for me so far. to make off a little change the     <multiples value="4"/>  <multiples value="2"/>
5 and 6 would be siren 1 and siren 2

So easy terms it starts the lights script from 1st input to last
 
I hope this helps!