I'm not one for Military Supplies within SAR, however they do have a place at times, but I came across an advert in Trail last month and I think they could be quite useful.
Can't remember the last time I didn't go on a search and either use a glow stick or lend one to some one - maybe this is the way forward.
http://www.military247.co.uk/inc/sdetail/658
It's called Krill Light and they are battery powered and not filled with chemicals. 20.99 is the advertised price.
Just thought it may be a money saver and one less thing to buy everytime you walk into an outdoor shop