& is used with permission.
Chag Pesach Sameach to all our Jewish friends!
This is of no small interest to me, because prior to this the only long-lasting candles that I have seen were the bulky and not-cheap 36 hour survival candles that everyone knows about. But for about the same price a one 36-hour candle, you can get six Yahrzeit candles. Admittedly, you can't cook with them like you can with the 36-hour ones, but at this price they're a great way to make sure you have illumination during power outages.
Now before you start to worry if this is sacrilegious, I specifically asked that question of a Jewish friend and I was told "My parents have used them for years as a bathroom nightlight during power outages - they come in a glass container, fit into the toothbrush/cup holder tile thing, and are odorless."