When i first got my 1W 808nm i put my finger right up to the diode (with no lens) to see if i could feel the heat... 0.5 seconds later, answer is yes lol. but i would not focus it and put my hand there. are goggles with a rating of OD4 good enough for 1W lasers? i saw someone with OD12 goggles :-/.
How many people are going to post that 405nm causes cancer? It DOES NOT cause cancer, several members more specialized in the area have speculated it is no where near the part of the spectrum that causes cancer. But I can understand why guys on the forum wouldn't want this posted, I guess it does give off a bad image, even though it is quite interesting to see a laser tattoo