No, I didn't know until I read the instructions on the Base Camp web site on lighting the lamp:
http://www.base-camp.co.uk/instructions Vlux.htm
Some useful stuff there.
Geoff
From basecamp site:-
for the tilley lamp not the vapalux. The tilley uses the control knob for lighting and extinguishing.
Lighting procedure for the Tilley stormlight is as follows:-
1) Make sure lamp is turned off.
2) Unscrew pump and ensure there is sufficient paraffin in the tank, approx. half full, replace pump.
3) Should you be re-lighting the lamp and know there is sufficient paraffin in the tank, always loosen pump to release any pressure present then retighten pump.
4) Ensure mantle is in good order, (see 'fitting new mantle' if absent or damaged)
5) Soak preheater torch in methylated spirit.
6) Clip preheater torch around vapouriser stem, light and slide up under glass.
7) LEAVE THE LAMP ALONE!!, don't fiddle!, when the methylated spirit begins to burn down give three to five full strokes on the pump.
8) Just before the methylated spirit goes out turn on the lantern and the mantle should light with a gentle 'Pop' and give a slightly yellow light.
9) Allow to burn for 30 seconds or so then give several strokes on the pump until the mantle is burning bright white and the lantern gives a steady hiss. Over-pumping will cause yellow flame outside the mantle and can damage the tank.
To extinguish the lamp simply turn the control knob off.
Older models have a small 'nipple' on the tank, if working, (and they seldom did), a rod will rise flush with the top of the nipple when pressure is correct. If the light begins to fade or the mantle 'pulses' light give additional strokes of the pump to restore brightness.