You'll find normal room lights obnoxiously bright and wonder what the hell we're thinking if you try exclusively candles or very, very dim handheld lights/lanterns after sundown for a while (think, medium-bright night lights at the very brightest, and even that's kinda too bright) and entirely avoid glowing screens. Might find the insomnia or night-owl tendencies that're "just how you are" disappear in a hurry, too. Go figure, if it's not actually dark and there's an incredible amount of flashy entertainment on tap it's really hard to sleep like you're supposed to. Wonder why we have problems with that, as a society. Guess we'll need a whole cottage industry of books & magazine articles to mis-explain it.

Lightbulbs and refrigerators don't contain electronics. I mean, modern LED lightbulbs contain some primitive electronics, but basic refrigerators do not.

By "electronics", the GP means consumer electronic devices like computers, televisions, and smartphones.