Photon Fix - 1 watt of green - Interesting Safety Issue

[mccarrot]

I had no aversion response, in fact the scans were so comfortable I found myself looking into them deliberately!!

How much have you been drinking
just kidding...

the 10X MPE rule with a green only you can have 100mw/cm2 of pure green, with a RGB projector you end up with only 15 mW/cm2 for green (30mW/cm2 for blue and 55mW/cm2 for red) so a 10X mpe green laser will look much brighter compared to a RGB.

Next, during the tests I have done with the simplified approach I have discovered smoke can have a big impact on the power.
I doubt if the show was within 10XMPE without smoke.

Also I have also attended lasershows with 100MPE and above, and I can still read this forum. Even the 10X MPE is pretty conservative, as your eye will be smaller than 7mm when the light hits the eye, and this effect does have a big effect on MPE calcualtions.

And a 1W advertised laser will maybe only put out 700mW after the aperture (especially this cheap 15K model)

[DMills]

Smoke (as opposed haze) can have a huge impact on power, and the other thing that makes a big difference (to perceived brightness and to pupil diameter, not MPE) is other ambient light, a good solid burst from some atomic strobes before the start of the laser show dials pupil area down quite nicely, not that that helps if you are 10 feet from a watt at 0.5mrad!

Regards, Dan.

[sbk]

Next, during the tests I have done with the simplified approach I have discovered smoke can have a big impact on the power.
I doubt if the show was within 10XMPE without smoke.

Isn't what I was precisely telling a few posts before...

You can see on the video that there was permanently a great quantity of thick smoke in the few first feets right after the aperture of the laser projector, which may influence the remaining power after travelling such that smoke!

I remember sometimes my old 1W laser was barely passing through a big burst of smoke!

[Adrian Cavaleru]

I'm sure that even 5w couldn't pass through a big burst of dense smoke