sod using the petzl ones, I cave and spend a lot of time underground and I use a cheap energizer headtorch :
http://www.discountofficeproducts.co.uk/energizer-headlight-torch-with-comfortable-head-strap-each-pr-101036.html
I seriously reccomend this, plus I accidently left mine in the rain for two weeks and it still works, it has been dropped in raw sewage and it still works, dropped from 30 foot onto concrete etc.... it is cheap and works like a treat.
@Guerillaphoto started
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sod using the petzl ones, I cave and spend a lot of time underground and I use a cheap energizer headtorch :
http://www.discountofficeproducts.co.uk/energizer-headlight-torch-with-comfortable-head-strap-each-pr-101036.html
I seriously reccomend this, plus I accidently left mine in the rain for two weeks and it still works, it has been dropped in raw sewage and it still works, dropped from 30 foot onto concrete etc.... it is cheap and works like a treat.