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I use a 4" x 12" 'pipe' to contain a bit of fresh lump and hit it with my heat gun. If using a soft lump such as RO the gun takes less than 40 seconds to get it blazing.
Doing it this way really contains the fire to a small cone that will run L & S forever if the vents are choked down properly. You do have to have the bottom vent open 25% more for the same temps vs lighting a much larger area of the fuel load.
Link to video: