This very well may have been my friends, as we usually extend our sessions after the sun goes down.

We have a couple of these headlamps. Cheap, and super bright. They have a zoom function so you can concentrate the light as needed:

http://www.amazon.com/gp/product/B00QAAZY00?psc=1&redirect=true&ref_=oh_aui_detailpage_o05_s00

Then we use these as floodlights. Not super durable, but very bright and cheap, and the brightness is adjustable via dial.

http://www.amazon.com/NEEWER%C2%AE-Dimmable-Digital-Camcorder-Panasonic/dp/B004TJ6JH6/ref=pd_bxgy_421_3?ie=UTF8&refRID=0BFHGB0K90J2N6SASFDM

http://www.amazon.com/Generic-Replacement-NP-F550-Digital-Battery/dp/B0007Q9PWQ/ref=pd_sim_421_1?ie=UTF8&dpID=51DW8ndgtKL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=1QD2ST71K4MTG47GN6J7

http://www.amazon.com/niceEshop-NP-FM50-Np-f330-Np-f550-Np-f570/dp/B000OPB4U6/ref=pd_bxgy_421_2?ie=UTF8&refRID=0BFHGB0K90J2N6SASFDM

Two is enough to light up anything but really big problems. We combine those with the headlamps and have been able to light up things like High Plains Drifter enough to get good video in the middle of the night.

Trust me, this is what you want. Most of the people who have climbed with us end up asking me later what lights we were using so they can buy some for themselves.