Trigger voltage is not related to to flash duration. No incandescant flash from a light with electrical contacts is triggerd by that electrical impulse anyway, but by an explosive that is triggered by electrical heating. That heating though has a retardent effect on triggering.
Originally Posted by M Carter
Keep in mind that there are different times to talk about.
With the development of types the trigger voltages and all times involved had been reduced with those common consumer models of bulbs.