What power(mw) of green laser pointer is needed to burn matches or pop balloons?
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50mW minimum ... 100mW would be more reliable.
Read the reviews on some of these lasers!
http://www.dealextreme.com/products.dx/category.911
Users discuss their success (or lack thereof) in burning with different powered lasers.
Also, many of the green lasers produce a lot of 808nm IR light. Especially the cheap ones that don't have an IR filter. This IR radiation aids in popping balloons and lighting matches. It also makes them quite a bit more dangerous with respect to burning out your eyes. I believe over 5mW is illegal in the US ... be careful!
Edit: What burns things is power density (watts/meter-squared). Thus the smaller the area of the 'spot' the less energy is needed to burn. Also, darker colored objects absorb the heat better and tend to burn easier. Many times people put a black 'sharpie' mark on the match tip or the balloon. Under absolutely ideal circumstances, you might get a 10mw laser to burn ...but it will not be easy.
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