@PotatoClose @PSQ17266 @Kit_Yates_Maths The carbon impact is low, it's much less than lights. How long to manufacture, I don't know, but much longer if you don't start. They're certainly available in large quantities, many schools, offices, restaurants, gyms, homes, etc. did install them and there weren't big shortages
@PotatoClose @PSQ17266 @Kit_Yates_Maths 碳影响很低，远低于灯光。生产多久，我不知道，但如果你不开始，时间会更长。它们当然可以大量使用，许多学校、办公室、餐馆、健身房、家庭等都安装了它们，而且没有大的短缺