The You Tube link is broken. The other link refers to a "9V" battery. It does not give more details. The most common 9V battery is for radios and will not supply 1.2A.
I was aware you were using flash paper. The name"flash" caused me to assume a fairly rapid flame propagation speed. Thus, igniting a small area in the middle might be as good as igniting a larger section. You still haven't said how big an area you need to ignite.
Also, consider the difference between temperature and heat. Incandescent light bulbs come in all sort of wattages. The filament of a 1.5 V bulb will be about as hot (given the same color temperature) as the filament of a 1000W bulb operating on mains voltage, yet it will consume only a small fraction of the wattage of the larger bulb. Your description implies that temperature is what you want and not necessarily a lot of heat.
John
I was aware you were using flash paper. The name"flash" caused me to assume a fairly rapid flame propagation speed. Thus, igniting a small area in the middle might be as good as igniting a larger section. You still haven't said how big an area you need to ignite.
Also, consider the difference between temperature and heat. Incandescent light bulbs come in all sort of wattages. The filament of a 1.5 V bulb will be about as hot (given the same color temperature) as the filament of a 1000W bulb operating on mains voltage, yet it will consume only a small fraction of the wattage of the larger bulb. Your description implies that temperature is what you want and not necessarily a lot of heat.
John