old time flash with flash powder

Does anyone know the amount of lumens from an old time flash with flash powder. The reason I'm asking a theater dept can't have flame or sparks do to the fire marshal and they need and old time flash appearance so they want use led flash and smoke but need to know the lumens so the are close

I have actually used flash powder twice, back in the 1950s. Very unusual requirements which meant that PF100 flashbulbs were insufficiently powerful.
Unfortunately, I can't remember very much about the stuff other than

• it was supplied as two parts, mixed before the user immediately prior to use. The actual output varied vastly depending on the accuracy of mixing (difficult in the field!)
  
• measurement of the combined volume used tended to be 'empirical' - approximating the "spoonful of sugar helps the medicine go down" school of accuracy. The tendency was always to use 'just a bit more'.
  
• whether the powder was spread along a trough or in a heap reportedly made a considerable difference to the light output.

That's more information than they currently have....thank you...

stanclark wrote in post #18174332
That's more information than they currently have....thank you...

You're welcome. Sorry I couldn't be more specific.