My kids have balance bikes and love to ride around the house. They want headlights but the handlebars are really slim. One is 23mm and other is 1/2" or 12.8mm. Any recommendations for a small, cheap, and not too bright LED light for their bikes? I was thinking about those cheap flashlight mounts and a pair of AA powered LED's, but you guys know the market better than I. Ideally a AA powered light with a built in strap for tightening around the bar would be perfect.