Joseph Johnson: Does the Minister realise that he could help businesses, as well as households, to reduce their energy bills, by introducing mandatory motion-sensitive lighting systems? That would reduce the carbon intensity of our built environment and promote the ability of many people to enjoy starry, starry nights.

Gregory Barker: That is just the kind of technology that will be brought into the reach of millions of homes by the green deal, and it is just the kind of innovation that we want to spur. We would also look at how we might drive that by making amendments to consequential improvements. I am very interested in my hon. Friend's ideas.

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