I just got some torches/bike lights from eBay:
XTAR BK10 Torch - £28 for the torch, waterproof to a few metres, have 4 modes rated at high 450lumen/3hrs, med 8.5 hrs, low 24hrs.
Each torch uses one battery (18650 3100mAh 3.7v Li-ion) and comes with the bike handlebar mount, spare O ring and lanyard. The torches also have a choice of metallic colour bezel.
Batteries - £19 for 2x18650 Batteries, comes with a nice small plastic travel container.
Charger – varies from a £5 for a single pot to £23 for the six channel charger which I got.
All from an eBay UK seller (multicorepc). Ordered Sunday night, arrived Tuesday well packed and a recommended seller IMO.
On initial test they seem considerably stronger than my expensive (albeit 4 year old) Ay-Up bike set and much more flooded. I would say a single torch puts out twice the amount of light of an Ay-Up, two torches throw out a huge amount of light. And I say this when I thought they Ay-Ups were good!
I got them initially for walking at night / camping and for a spare set of bike lights if my GF wants to come out on the bike at night with me, but they seem pretty impressive, solid and well built. Far exceeded my expectations. In fact if they work on well on the bike they may well replace the expensive ay-ups, although they seem bulkier.
Need to test the battery times but for the this price (around £50 for one, £80 for 2) they seem very good indeed.
I also got a 2 channel XTAR charger from a Chinese reseller that doubles up as a USB charger for other devices (phone, iPad, etc…). Idea is you charge the Li-ion batteries with it, then flick a switch and use the batteries for USB charging other devices on the move when needed. Neat.