The following text from their kickstarter page sugests to me that even they think they are dodging the spirit of the law, even if it's been deemed to be within the letter of the law.. How long does it take for the light fixture attached to a KosherSwitch® Classic to turn on/off? In Normal Mode, it’s instant. In KosherSwitch® Sabbath Mode, there’s no way to predict how long it will take, since the device must go through one or more cycles, each with a possibility that it will fail to function as intended. Typically, it will take “dozens of seconds” but sometimes, randomly, it can take more than a minute or two. Underlining and italics are my emphasis.
"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life." - John Lennon