It doesn't matter if the cage is 2ft 3ft 4ft 5ft or 6ft long.if a 40w rhp gives a hot spot of up to 40c in a 3ft x 1ft viv then it will give a hot spot of up to 40c in a 5 ft x 1ft viv because it's the same distance away from the floor. I've never used a 40w but I would have thought that it isn't working properly if it's not heating enough to give a Good hot spot.
Pulse turns it on and off very quickly to maintain 1 temp. On/off turns it on till it gets to temp and then leave it turned off until little dropped a few degrees and then turns it back on again. Dimming pulls power back to keep one temp.
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