no its definetly 150mw i have to focus it down to the smallest point or it wont smoke anything or burn anything. I have now got a 1w diode and their is a big difference in burning.just wondering-- are you sure your 405 is underpowered?
1W looks very dim but will blind you in less than .25 seconds if it hits the center of your eye.
Does it 'smoke' black paper (etc) instantly? if so it may be 1 full W-- the best way would be a LPM. By the location you have in your profile I think I can say there are no members near you who have a LPM.
...too- bad ...members will meter free anytime any laser.
Some have shipped lasers to Vets owning meters to calibrate and send back= free afaik..
also 405s overheat easily. And sometimes they do not completely die --we call those 'zombies--the living dead'
btw never power one up any diode without a good heatsink.
You may have already known all this but I give it anyway.