may I be the last to suggest that super-bright is not helpful, front or back ?
+1. Did no-one actually read this?
oh, and get some of the reflective ankle straps - the uppy/downy pedalling motion really stands out.
+1 or this?
..... Far too many people round here rely on dim lights and reflective kit - by far the ones that get widest avoidance are those who're piercingly brightly lit.
I don't think the suggestion was 'dim' lights - people riding with only a couple of those emergency back up lights are nuts BUT you don't *need* to spend huge amounts on commuter lights. Katie and I spend a lot of time riding around together so I get to see what our different lights look like from a distance - the dynamo powered lights on the Bromptons are show up as well as anything when coupled with some reflective.
Don't rely only on flashing - it makes it difficult to judge distance and speed. Flashing on the back as a secondary, or in half light, is ok but only on the front in an emergency.
Fairly low end, but quality, LED lights (Cat-eyes from around £30) are now fine on front and our 5 year old Vistalight Total Eclipses are great on the back. On the rest you're paying for construction and long lasting rechargeables.
What you really want to *avoid* is huge amounts of unfocused light - front or rear - which is what a lot of homebrew/chinese/off road focused lights will give you. There was a guy I used to end up behind sometimes with some hugely overpowered single LED rear (might have been a Dinotte) pointing straight back that would leave me nearly blind for 30 seconds after I passed him.
Personally I'm now on an Exposure front and rear with a Vistalite total Eclipse as a secondary rear (if i run the front down enough to have to go to flashing I can use this on it's own) plus reflective ankle bands and some silver scotchlite on my helmet.