Howdy IanHale, The first thing that I do is PANIC, then run around like a chicken with my head cut off, then I turn on every battery powered flash light and hope that the power comes back on! No. seriously, I am working on installing some auxiliary lights. They look light wall light switches, but have two rows of COB LEDs and are very bright, I have not seen any details on them, but they are difficult to look at directly.
I was not joking about the flashlights, I had them hanging up all over my grow room when we had an outage last year.