19th century people needed some explanation to understand the difference between the regular candlelight and the electrically simulated candlelight. Note the disclaimer at the bottom: “The use of Electricity for lighting is in no way harmful to health, nor does it affect the soundness of sleep.”
For all we know 19th century philosopher Friedrich Nietzsche was inspired by the developments in lighting technology when he wrote that “in the end, every second nature becomes the first”.
See also: Luxalive the emotionally aware lamp, Magical interaction. Thanks Berry.