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http://www.kitlaser.com/is-it-possible-to-use-a-laser-pen-for-recreation.html
When purchasing, the pointer power laser online store, please select one that will work best for you.If you need a laser pointer to your cat or dog to hunt, what you really want is a pen of green laser.What's more important to you is the quality of the laser.If you want to use the safety and ultra-bright lasers for astronomical applications, go to a green laser pen, and power range, recommended for 30mW - 100mW. Now, once you've decided how much power you need for the laser pointer, your next decision is the color of the laser.Red laser Pointers are usually cheaper than other colors.You can even buy a red laser pointer with a good bill, and use a AAA battery to get to the $5.99 in our store.The green laser pointer is usually more expensive, often 10 to 20 times more expensive than the red laser, but the green beam is much longer.The green laser appears to be about 80 times brighter than the red laser beam with the same power.The reason is simple - the human eye is 80 times as red, green, and more sensitive, so the green beam looks brighter at the same power.
Green is the most visible color because all its beams can be seen by the human eye.But users should make sure they find a laser.Otherwise, they may cause damage to their eyes.Keep in mind that the laser pointer can be both useful and interesting laser stroke of 5000mW.The first laser pointer is available in red three colors.But as technology improves and manufacturers have been able to safely make laser Pointers to other wavelengths, several colors become available.Each different color laser pointer is best suited for different purposes.