Dang - after seeing Ole's prediction on color, I was going to say yellow-green, as that is the peak of the L cone's pigment response for photopic vision... and it has the widest wavelength reange response too.
So it's looking like reverse engineered alien technology then...
Yep, it did occur to me that my dark-adjusted eyes may be seeing yellowish green just because that's what they'd see best. Unfortunately, both my spectrometers are slow-scanning instruments and I don't have a fluorimeter. Maybe I can find one over in chemistry.
A green light you say..
That's very obviously a form of electromagnetic radiation or light emission of frequencies.
Which is produced by sub-atomic particle interactions, such as electron-positron annihilation or radioactive decay.
And if you're not careful, you'll end up just like this..
If you saw a man drowning and you could either save him or photograph the event...what kind of film would you use?