It's also a Wisconsin study, but we, at our shop, have bench tested CFL bulbs, standard bulbs, and LED's and halogens at our shop via an oscilloscope, the sine wave is the choppiest with any gas or CFL bulb. Halogen was the rage in the marine industry, but the offset was current draw and heat.
Now the LED's are the rage, but right now, they are too pricey. Prices should adjust over time, and I hope they do.
You also have Harmonic Disturbance in a sine wave, we measure it on yachts with automated systems, most houses and bldgs. average 1.7 to 7%, the magic number is less than 5%. If these "green" bulbs crash my nice sine wave into mountain peaks and valley's, let alone EMF, I'm gettin' LED's. all the light, half the current, none of the heat.