I don't think light-emitting devices made many appearances in this thread. A lot of space heaters, maybe.
That's a shame, from my point of view, because the reason I was interested in the subject has to do with my feeling that in the US, the labeling system is not good for beekeepers, because it does not adequately distinguish between imported commodity honey and that which is produced here by conscientious American beekeepers. I'm not saying anything bad about beekeepers in other countries in general. But a lot of, for example, Chinese honey is not the best honey. There ought to be ways that the consumer can tell the difference.
I guess I'll have to start another thread.
Apologies in advance!