Depending on whether you can spend some cash on your hobby or not, have a look at LED grow lights.
I use IKEA Vaxer (2 storey) grow light set-up and have had seedlings growing in a cool room with the lights on a timer giving them 14 hours light a day. Here is a link… http://www.ikea.com/gb/en/products/indoor-gardening/
The initial cost is quite high, but once you have them they should last for many years.
