Dim lights and guerilla shopping

Yesterday, we decided to do some guerrilla shopping in Sainsbury's, before things started kicking badly with the coronavirus. It was a strange and not very pleasant experience, but we managed to get most of what we wanted and I think we should be all right for the next few days at least. It was weird to see the aisles half empty and the dim lights. This is what struck us the most. Why the dim lights? It looked like we were at war. I guess we are, in a way. We were guerilla shopping, as we are bracing ourselves for guerilla living.