I'm studying at electrical and electronics engineering. We have a contest. We have to pop balloons which from 10 meters distance away in most shortest time. We want to use laser. But we did not select which laser (power) should we use. What do you think ? I'm wondering what can you recommend? Should we use any focusing attachment with lasers? Do we have to use special custom designed lens? Or if we buy normal lens? For example if i buy a 2 or 5 watt laser with a lens where can i buy optic (sunglasses) shop?