The light in the link below could be used to clip on to your chest harness
for extra light or for an emergency
light on a long ascent, or a pitch with rebelays.
http://www.drywallzone.com/images/product_images/catalogm06.jpg
It has a rugged metal clip and a bright yellow switch, and the light shines
90 degrees.
Only cost about $ 10 at Batteries Plus.
2 of these lights could be easily duct-taped together to give you even more
light,
while you are on rope.
On a related note,
Batteries Plus also carries a Remington LED headlamp, claiming 150 lumens.
http://ecx.images-amazon.com/images/I/91JnhcsdzwL._AA1500_.jpg
