Helping others in the darkness

Salaam, I have a small issue with the niyat i made a long time ago. Last year i put some outdoor lights in my neighbour to help my community to cross the path at night as it is the shared path by 7 houses. It was so dark that kids cried at night with their parents when they passed through that path. However each house as their own outdoor light which they dont want to turn on. Therefore, my wife asked me to put 5 lights in that path so everyone will feel ok crossing this path and ask me to do niyat as "We are doing it to for good cause and Allah will be happy from us to show light in the darkness". Now i want to take one off from it and want to use it for my home. Can i use it in my house or i shouldnt use it in my house because of niyat? She said you cant use it as I have done niyat in the past. Please help with your knowledge.