Unfortuanately this is a hard one to get around, OFP is buggy like that. The only way to get around it that I know of is to add more lights to the map with wrptool or wrpedit. You basically open the map, add your lights, throw the map back into OFP and youll have street lights that work how there supposed too, Theres more info on wrptool on this forum, I found wrptool easier to use then wrpedit
Im sure smarter patrons here can help you better than I