I have an ebay green laser about 50mw or so it said. I also have a 5 mw green. The problem is both lasers changes intensity and are not consistent. The 50 mw is brighter all the time than the 5 mw but sort of flicks back and forth between brighter and about the 5mw level while on. I tend to use them for longer periods of time point things out so a constant on might be the issue? They are both 2 AAA lasers. Since I use it regularly at work I want a more reliable unit, suggestions?