About green laser beam

It is always better not to buy your laser pointer from online sites and auctions, as the power advertised therein will most often be fake. In case you still want to go online, stick to the trusted sites only.
You can go for visible beam green Laser Pointer 1000mw as well. Such laser pointers come in the power range of 20mW to 80mW. During daytime, the 300mw laser pointer beam is not visible, though it is very bright. Instead, you can just see a bright end dot. The brightness of the100mw laser pointer beam is directly related to the price. If you are looking only for a bright beam, choose a pointer in the range of 40 to 60mW, which is also prized moderately.

Note: Green Laser Pointer 2000mw are very dangerous to the eyes and can cause permanent degrading of vision (some doctors say any laser above 5 mW can cause eye damage), so use with caution and never point at anyone's face

Burning paper requires 1 watt (1000 mW), which is more than what most laser pointers can achieve without modifications

For comparison: Popping balloons or lighting matches requires roughly 100 mW (which is the high end mW range of most commonly found laser pointers）

http://bloserver.com/buylaserpointer/

http://www.ncbi.nlm.nih.gov/myncbi/1nW3oqf7u68Qt/cv/75119/