I noticed some bikers seem to have some kind of 'flash light' on the steering wheel of their bike. I believe these are specifically made for bikes. I'd like to add one in order to have a better view on the (distant) road in darkness. Safety concerns really. Something really reliable/durable.

Can anyone give me some advice, experience? Especially, which brand(s) do you recommand?
Rechargable battery or not? Luminosity? ...