I do loads of night riding (not talking about a meander along the towpath either) so have got Lumicycle for the bars, but my lid light is a £20 cheapie from Amazon (battery goes in my pack).
I’ve had Lumicycle bar lights for years and find them to be very good, as the battery connections haven’t changed it’s meant I’ve upgraded in stages since those first halogens and am now rocking their LED units which are awesome. That said I can’t fault my cheap helmet light, the battery went a couple of years back but I got an equally cheap 6-cell replacement so I’ve even less chance of it running out of juice – not that it did beforehand.
Mates have got Exposure Six-Packs and are more than happy with them and the fact they are self-contained so no cable faffage. They have a mix of the cheapie helmet light and exposure joysticks up top.
There must be other more budget bar lights about though and I’m sure a few will get mentioned.
That said, when I think about what we used back when we started night riding I can’t believe we’re all still here!! Mind you we do go a LOT faster now.