OK, just a bit of advice on what to expect from the lights...
this is my set up. there are two kinds of lights. lights to see with and lights to be seen by. in the centre is a Hope vision 1
like this (to see with) and the outer two are smart 3 LED Polaris lights
a bit like this (to be seen by). i use the outer two on flash mode to "get noticed" and also as a back up to the centre one (as the hope will just shut off when the batteries run out).
OK it costs a lot more for the hope but you really get better light from it
this is the light from one of the smart lights....
not really any good for unlit roads, unless you want to walk !!!
and the hope, already brighter on lowest setting...
and there are three more settings...
big difference between the first and last photo
the smarts run on 2 AA batteries and the hope runs on 4 AA batteries but the hope will eat batteries in the higher modes (1.5 hours with good batteries) so you have to invest in some high power rechargeable ones. so your looking at around £80 - 90 in total.
i like the hope and im really happy with it. cycling plus magazine have a good review on lights this month and they didn't rate it very high mainly due to weight (one of the brightest light outputs though). from this review it looks like there is now a lot more choice when it comes to this type of light. it may be worth you getting a copy.
so there you go, if you want good light output, your best NOT to waste your money on those cheap lights.
invest in something worth having