A lot of the Fluorescent lighting I've seen causes plants to stretch. My halides don't cause any reaching/stretching for the light and they lights are 4-6' above the plants - a lot of them. I still think Halides, while expensive, are the best way to keep plants alive and happy indoors. I would only use Fluorescent if I had another light source to supplement the fixture.
In layman's terms, and correct me if I'm wrong:
The K value is how close the light is to natural sunlight. I think 6000K is close to normal sunlight (judging by the chart on the previous page). So it's like the quality of the light.
I think the Wattage and PAR sort of go hand in hand. Wattage is like the "power" of the light. The output of the light is always a good deal less than what it actually uses to run the light.
The PAR value is the "fuel" of the light; at least in terms of being a plant. Like food.
Again, this page is good at explaining it in detail:
PAR Watts, Spectral Distribution & Kelvin Temp.