I struggled with lighting for a long time. Like you I had a poorly lit room with an open window. and I had to break it down after each shoot.
I tried a Workplace halogen from Home Depot but even when trying to diffuse it I had waay to much light. Simple household incandescents never provided enough light. I ended up buying to umbrella style light setups from eBay and used an LED mounted on top of the camera like the one you linked to. I get nice, even consistent lighting with every shot now. - C. Thomas