Ms Elaine Dennehy:

On efficiency, MIT discovered in 2017 a way to make the old incandescent light bulb more efficient than LED by recycling the heat that is lost in the filament and bringing it back into the bulb to use that energy. So straightaway we have a health light source that could be used easily in homes and workplaces. It would be more difficult to get it into springs and homes but it could be used to supply street lighting. So we can do something, it just has not been examined yet. I have nothing else to add.