A mega watt for a pico second is nothing but if it hits your eyes...
When Rossi first referred to the visual output of his SK reactor, he required the use shade 14 welding glasses.
Here is rossi's dialog
Dear Dr Rossi,
I have received your invitation to attend the presentation of the industrialized Ecat SX and again I want to thank you.
Just a suggestion: I suppose that to look at the SK could damage the eyes: will be enough to wear sunglasses?
No, sunglasses do not protect even a bit.
The light irradiated is very strong. We will supply to the attendants masks with protection 14. To look at the light of the Ecat SK without this protection is very dangerous for the eyes, even for several seconds.
Another reference as follows:
we had to protect ourselves behind a grade 14 glass because looking at the light radiated by the SK could damage seriously the eyes. Few seconds after the turn on of the reactor the heat radiated from the Ecat SK broke the 14 protection glass. We had supplementary 14 protection masks. Nonetheless, I saw from that minuscule reactor exit a tremendously dazzling white light all around the laboratory and I will never forget this impression. The SK was born. I think we will make it useful. Many errors emerged, but now we work to correct them, the most difficult part has been resolved.