Currently there is a huge limitation in how we can intuitively handle reflectors and illuminated textures. Even with the recent addition of commands for isLightOn and the like.
Very simply, when dealing with vehicles the default game functionality for controlling the lights is via the default "L" keypress. This will turn ON the relative configured reflectors or markerLights (ie.. not necessarily all configured reflectors/markerlights). But it does however kill ALL reflectors/markerLights when the 'OFF' side of the action is used.
This is less than ideal, as you end up with ALL reflectors turning off, but illuminated textures remaining. Again, there is no intuitive way to deal with this currently regarding the illuminated textures.
An animation source controller for lights/marker lights would fix this.
And to take it a step further, it would be really nice to have independent reflector classes/controls for turrets.