Blue light from artificial sources is on the rise, which may have negative consequences for human health and the wider environment, according to a study.
Academics at the University of Exeter have identified a shift in the kind of lighting technologies European countries are using at night to brighten streets and buildings. Using images produced by the International Space Station (ISS), they have found that the orange-coloured emissions from older sodium lights are rapidly being replaced by white-coloured emissions produced by LEDs.
Those sodium bulbs – often – used scandium. To the point that when I was handling scandium going into the light bulb business – for a couple of years it was 100% of global usage in that industry, for near a decade around 80% or so – then pretty much anyone walking under a rich world streetlight was, in a tiny and infinitessimal way, trading with me.
But that market has distinctly shrunk. Down from perhaps 130 to 150 kg a year globally to 30kg last time I looked at it. Technological obsolescence is a bitch…..