Same thing. Shimmer lines are 'shadows' caused by the refraction of the water surface. Like tiny little magnifying lenses across the surface of the water, there are great concentrations of light made in some areas, and shadows cast in other areas. The less of a 'point source' a light course is, the larger the wave has to be to produce the 'shimmer', or 'optical distortion. In a way, the 'shimmer' is a sign of a halide lights inferior penetration into water, as a light that is more of a point source than another will also diminish in intensity faster as per the inverse square law. But yes, for T5s, you can achieve 'shimmer', but it takes that much more surface agitation.
FWIW, since shimmer isnt always a good thing, the supplimental LED lighting systems that some EU mfg's like seaqualux put on their T5 systems are a very smart way to go. They give you the option of a more natural 'frequency' of 'shimmer' unlike halides by having the LED's programmed to go on and off along the length of the tank, similating the 'shimmer' of sunlight.