During my learning procces about lasers i was building a 405nm laser. Im not a hero with the solderblob. so what happend is that my driver started to melt. it defn. was broken. Shame i had no reserve drivers for those 3 x 405nm diodes i still had rotten away. Long delivery times in combination with a massive dose of aDHD made me just skip it. i conntected those diodes straight on 2x cr123 3,6v batt. and i tell u, it was very powerfull. the laser burned stuff like hell. Later i fcked those up by connect them on a 9v block lol. Now the question i got : what for do i need a driver caus whyle i use it paralel on 2x 3,6v cr123 the output is insane.