Whenever we think about the weekend after fresher?s week, all that comes up is a huge party, silly games, drinking and an even bigger hangover. But when we talk about a caving society freshers? weekend you have all that, and then the day after (or I'd say couple hours after) you go caving. And...

So I've bought an old Petzl Duo- the one with 2 halogens in the front (!)- and as you can probably guess I have no clue what I need to get now to make it into a half decent lamp. I know I want LEDs but don't know what I should go for/best combination etc.... Any help would be much appreciated  :)