... I always wear red iridium oakleys when I use it. Amazing how far you can see the beam at night. You can see the cloud bottoms...
If you can see the beam, then those glasses are totally useless. Sure, you're waving the beam around in clear air or onto clouds but if you get a direct hit or even specular reflection with that 1.6W blue, those glasses are going to do absolutely nothing for you.
If you're going to play with 1.6Watts get yourself a proper pair of laser safety glasses, rated
at least* OD3+ at 445nm and good quality, not some random cheap $30 ebay crap.
Eagle Pair would be the cheapest I would recommend.
The cheapest laser glasses I own cost $150, and
that is cheap.
My eyes are worth more than $150 to me.
* OD is optical density, OD3 is 10^3 = 1,000
So, for 1.6 Watts, 1600mW/1,000 = 1.6mW will make it through the glasses.
OD2 would pass 16mW and OD4 would pass 0.16mW (160nW) etc etc.
If you value your eyesight, it would be worth doing some research on laser safety glasses/goggles.
Have a good look at these threads and
read every post and make sure you take notice of Xoul's profile picture... it should make your eyes water, for good reason.
1 Watt:
http://laserpointerforums.com/f53/hit-eye-1000mw-445nm-blue-laser-69469.htmlonly 5mW (!!):
http://laserpointerforums.com/f53/laser-eye-damage-83085.html