>>2053895i used a dynamo once in my sister's lady bike, it was great because it used an incandescent light bulb so it lit up at any speed you were using it at. throttling and noise might be an issue with incandescent but it beats not seeing anything in the night and the simplicity of the whole thing made it reliable as fuck, even though it was some off brand plastic chinese thing (its working to this day no issues at all even though the rest of the bike is fucked beyond repair)
