Yep I use to run those back in the mid seventies on my Beemer and couple of Yamaha's I had, they were also outlawed and are now illegal. I however would use the cycle switch if I were on a motorcycle today, at least till I got popped for ticket. It wasn't a strobe back then, it was a electronic switch to cycle the power to dim the bulb or cycle back and forth between high/low beams.

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'10 Chrysler T&C Stow-N-Go White. Grandpa's ride.

'13 Chrysler 200 Touring Candy Red. Grandma's ride.

Age and cunning will always over come youth and vigor.