The fact that you're asking that question in the manner you are tells me that you probably shouldn't be operating a laser of this class. Stick with the cheap-o, $200 DJ lasers from china. Sounds like they're perfect for you. Now, if you seriously don't know why, it's because the operator of a laser of this class can easily blind hundreds of audience members in just a few seconds. Safety interlocks are a standard feature on all professional grade high power lasers.
