A one-watt laser is pretty powerful (Class 4). Most laser pointers in the US can&#x27;t exceed 5 milliwatts.  One watt is several times what&#x27;s needed to light various common materials on fire.<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=woiTedSKPrk" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=woiTedSKPrk</a>