They won't be growing so don't need light. I would put them in the garage, with peat or MPC around them and perhaps in a polystyrene box to keep out the frost.
Monty Don showed that on Friday night. Cut them down to about 8 inches, put in an old bucket, cover with old compost or leaf mould and put in a cool dry place, no light needed. Water very occasionally, just so they don't driy out completely. Although I must say, I just let my dry out and soaked them in Spring for an hour or two before planting, they came up big and strong.
Mine are in big pots. I just let the pots stay in the greenhouse which has a froststat on the heater.I let them get quite dry. I dont water until the weather warms up in the spring.