I have the following question: We are always being lectured to buy low energy appliances - fluorescent lights vs. incandescent lights and so forth. But what ever happened to conservation of energy, as a rule of physics rather than a pseudo-religious obligation? That is, suppose I use a "wasteful" incandescent bulb. Doesn't this "wasted" energy that isn't turned into light instead turned into heat. Assuming that it's winter, isn't that not waste at all since now I don't need as much energy to heat my house directly? I'm coming to the conclusion that as long as it's winter, it's impossible to "waste" energy by using the wrong appliances or light bulbs. Is there an error in this reasoning?