I dig Pallen's photo.
Picked up some of these last winter:
http://amzn.com/B004356WLY
The difference in ambient light in my growing area of the basement was remarkable. I also added another 4-foot shop-light. The result is that I'm no longer just maintaining over the winter, but actively growing! My 2-bulb shop lights (3 of them so far) are split with one 6500K (or other high temp bulb) and one "grow light" or terrarium light. The variation in light source wavelengths seems to be the trick for me and I'm seeing some very happy plants. Palms, Bananas, Succulents, and many other tropicals/citrus/etc. Many of them spend all year down there with no problems.