Yes I had Wonderlights, they ran off a doorbell battery and you'd have been better off with candles on the bike, I can't believe I trained down pitch black lanes with them on the bike. The plastic brackets would go brittle after 12-18 months then shatter when you put the lights on the bike.
They were proper shoot, but it was either those, Ever-ready or nick the corroded old dynamo off your dad's bike back then.