Light pollution has been a problem since long before LED lights. I don't think I've ever been able to see stars in Amsterdam. I do think fighting light polluti

Light pollution has been a problem since long before LED lights. I don't think I've ever been able to see stars in Amsterdam. I do think fighting light pollution is a worthy goal, but LED lights aren't the enemy. At least not specifically LEDs; all light are. But more careful use of LED lights could help us to shine that light only where we need it, and let less light escape. But it's going to require strict regulation; lots of companies don't care and just shine lights everywhere they can. > LED lights emit more blue light than regular bulbs. They don't have to. Rather famously, there are red and green LEDs. Blue ones are the most recent ones, but popular because they allow us to create any colour we want by mixing different colours. If you want amber LEDs, you can. Just turn down the amount of blue.