I live in northeast texas and about a month ago there was a heavy snow and it built up on trees and knocked them down. So there was a mass power outage for about two days. If I start a grow setup and if another power failure happens how long with out light will the plants survive? Should I invest in a generator because its a pretty expensive loss to have 10-20 plants wasted in middle of growing.With the cost of seeds and time wasted I mean.