What light's ? headlamps , inside lights ? If headlamps , lighting control module could be the problem ,or switch !
If your talking about auto headlamps, pull the two fuses in diagrams, it may stop your headlamps from draining the battery, till you can diagnose the problem. You have a lighting control module that controls the headlamps, that module may have a problem? It's hard for me to be sure, from where I'm sitting.
Can you check for applicable trouble codes, to see if a code points to lighting control module. Some of the national brand auto stores will check codes for free, if there are any.
WARNING: The halogen bulb contains gas under pressure. The bulb may shatter if the glass envelope is scratched or if the bulb is dropped. Handle the bulb only by its base. Grasp the bulb only by its base. Avoid touching the glass envelope. 
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