Thank you Prateek, Gandhar & Praveen
BTW,was it a guess?
Around 20 years back, I had built a small Light / Sound activated Camera shutter operating circuit for one of my friend.
With that Circuit, we could easily snap pics of Balloon bursting, Lightning Strike, Gun Shot, ect.
I just remembered that when Anwar Bhai mentioned "
brightly lit sky" and I keyed in
Sanjay