Quick Question plz reply

I was using a 1000 watt lamp in a area that was wayyyyyyy to small so i decided to downgrade. I found someone local who is gonna give me a digital 400 package trade, but here is the problem. I was using this as my only lamp and now my plants just over 1 week old are going to be without light for atleast 3 hours. Its a shitty overcast day today in toronto and i dont think window sun is a option, anything i can do or should my stop on teh way home be a seed bankÉ

Just put a couple CFL's over them, it will be fine if your only gone for 3 hours