I bought a 120-watt infrared laser from Sunglad Lasers. I'm confused: why is there a red dot when it's turned on? Aren't infrared lasers supposedly invisible to the naked eye?
I tested it, and it quickly set cardboard boxes on fire. I pointed it at a cockroach in my house, and it quickly cooked. Very interesting; this shouldn't be considered animal cruelty, right? 

