i have had a 50mw green laser in the past and thought it was quite cool, so i became intersted in lasers. the other day, i built my first laser, it is a 500mw 638nm mitsubushi ML501P73-02 diode with a 3.6V~16V 925mA Constant Current driver. i assembled it all in a c6 flashlight host and i was really pleased. it was burning really well and i was impressed however after only 2 days, the laser became significantly less bright and a lot less powerful, it no longer burns and is not very bright at all. any advice would be appreciated because im new to lasers and dont know the cause of the problem.