My other half has something similar to this..
http://www.ebay.co.uk/itm/2000-Lm-CREE-XM-L-XML-T6-LED-Bicycle-Bike-light-Head-Light-Headlamp-Rechargeable-/251364426698?hash=item3a867cc3ca:g:AwYAAOSwRLZT0MbJ
His is an older version, which from recolelction is 1500Lm - its insanely bright, so has to be run on its low setting and angled down for use in traffic. But as an additional light for dark lanes etc its very hard to beat. There are similar items on ebay up to 10000Lm (quoted).
http://www.ebay.co.uk/itm/2000-Lm-CREE-XM-L-XML-T6-LED-Bicycle-Bike-light-Head-Light-Headlamp-Rechargeable-/251364426698?hash=item3a867cc3ca:g:AwYAAOSwRLZT0MbJ
His is an older version, which from recolelction is 1500Lm - its insanely bright, so has to be run on its low setting and angled down for use in traffic. But as an additional light for dark lanes etc its very hard to beat. There are similar items on ebay up to 10000Lm (quoted).