I love my schmidt, but I have not used the Shimano.

I have a DLumotec LED primary headlight, which provides plenty of light (for me) most of the time and provides light at low speed, and a E6 halogen secondary for higher speeds and real darkness. I do not know if the shimano will handle dual lights, but I don't know why it would not. Ain't even close to 30 watts, but it works fine for me.

On rural roads, I have noticed cars waiting at stop signs when they see me coming. And waiting. They must have thought I was a motorcycle.