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I’m talking about handheld laser with 500mW output power. Many laser hobbies are very interested in 500mW laser pointer. But before you rush to buy one of those things, there is something you should know about 500mw laser pointers. The amount of power of a cold laser is expressed in Milliwatts or mW, which translates primarily to length of treatment time and to a lesser extent, depth of penetration. A laser that is calibrated to deliver 500mW or less is called a cold laser. but cold lasers are not extremely safe. According to Wikipedia, laser pointers with power less than 5 milliwatts (5 mW) are generally safe to use, but devices with power of 100 mW or more sold on the Internet have recently caused permanent eye damage. Normally, a 5mW cold laser will deliver 6 joules/cm2 to a single point in 1200 seconds (20 minutes); a 250mW cold laser will deliver 6 joules/cm2 to a single point in 24 seconds; a 500mW cold laser will deliver 6 joules/cm2 to a single point in 12 seconds. A 500mw laser is extremely dangerous. You can cause permanent eye damage, not only with a direct hit, but a reflection off of any shiny surface can come back and damage your eye. Therefore, it should be used only in an enclosed room, with no windows, and EVERYONE wearing the correct protective goggles. Do not even turn it on unless you can meet the above conditions. Anything that is vulnerable to high temperatures should be careful with this laser. You can find lots of videos about 500mw lasers on Youtube. Someone use a 500mw laser to pop 23 balloons in a line within 1 minute. It’s incredible, but also you should see the harm it could cause. So, really be careful with those 500mw laser pointers!
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