Now that the nights are drawing in, I would like to change my lights. I am looking for some recommendations for a set of LED lights. My requirements are:

Cost app. £20/30 a set
LED lights
USB chargeable, reasonable duration of charge
various flash settings
Reasonably strong output
Suitable to fit oversize, cyclocross handlebar and probably seat-stay - definitely not under saddle as I always carry a bag.

Think, that's about it. All ideas welcome.