Light fingered

So today was a rare lazy Sunday and I thought I would help a friend clear out their attic. in amongst the boxes, the junk and grot I found this old lightbulb. When I picked it up...it started to glow......just a bit at first...then the light grew stronger.....so I thought....what I am I going to do with this?.......and then it came to me.....1/60th at f16...that should do it!