light deprevation

Next week I am having to have the power to my house cut off for aprox 20 minutes.

Unfortunately this work to my electrics falls in my 12/12 cycle in which I have a plant 3.5 weeks into fower.

My question is, will this 20 minute cause a problem to the flowering plant?....or should I get a generator in, or put a couple of 1 million battery lanterns in the tent until the work is fininshed....not sure what to do for the best to be honest......any sugestions or advise would be gratefull....cheersi

it shouldnt be to much of a problem, try getting a battery light, even if its like a cfl with only 20 watts, its at least light and doesnt make the plant think its time for bed

i doubt 20min would hurt much