I have just installed the 635nm 10mW red dot laser modules and I found that their intensity is too bright. Is there any way to dimmer them? The laser is got here: http://www.berlinlasers.com/635nm-red-laser-diode-module The target is only 400mm from the source and the beam is very powerful and causes discomfort to the eyes. I have tried a much lower voltage 1.5V DC power supply, but too lower voltage cannot support it. Is there any other method selectable to make laser beam dimmer?