I ride with a Nightsun Tri-lite. When all 3 lights are one it is equivlant to a 40w light. It also lights up every thing around. With the independently adjustable lights you can aim 2 to lite the sides of the trail and one stright ahead or any which way. Here is the link for the lites.
Tri-Lite
They are pricy being close to 400USD but they work great and have handled some good abuse.
Slainte
