I've tried a lot of different methods for lighting coals. Since I mostly use quicklights, I don't have an issue with trying to concentrate heat, but using that can over the stove sounds like a great way to heat up any coal quickly.
This is what I do....I grasp the coals horizontally with Egyptian tongs (they hold better) and use one of those long grill lighters (otherwise my hands can get burned), I light the coals over a deep laundry sink, so all the residue lands in the sink not all over the coach/table, then I wave the charcoal lightly while blowing on it to get it glowing red all over, thatís it!! I find that if the charcoal is completely red then you don't have to milk the hookah as long.
Hope this helps