Human-centric light is a selfish idea. Jane Slade is an expert in how anthropogenic light at night is harming all wildlife to some degree. In this rebroadcast of our live stream from last year’s IES Annual Conference she shares her work with Michael and Greg.

We keep learning new things about the damage ALAN does, whether that’s sending dung beetles walking in circles or slowing down the motion of free radicals in the air, but the solution is always the same: turn off the lights, then tell other people to do the same, pretending otherwise will just make it all worse.

She also explains why some of the security value of light is an illusion, the role controls and smart systems can play, pushing conservation past the photogenic animals, and the trouble with scientific conclusions are getting less obvious to the average person.