I snapped this with my Droid X the other night.
Sparklers are fun, right?
Well, if you multiply that fun times 1,000 in a pile, then it gets really fun, and hot, and somewhat dangerous. From my observations, sparkelrs burn much faster when grouped together. If a normal sparker takes 60 seconds to burn, 1,000 of them might take 6 seconds to mostly burn. This means there is TEN THOUSAND times more light and heat being released.
(Quick way to burn $40.00, proverbally speaking)
Also, if you are not well versed in, and professional about, safety considerations of very hot metal and bright light, then it is my advice that you do not even consider this.
Here is a washed out picture of the glowing metal after it is done.