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I still tastefully disagree. If you notice the 1993 article is posted about Lorries, the UK term for Semi-truck. The delay is not caused by the bulbs, its caused by the voltage drop and the slow response from the voltage regulator. Much like if you have a failing alternator on a car, any sudden large consumption of power causes a voltage drop, which is most notable in dimming of lights. LEDs would also be effected in an identical manner, they would only aid in the situation as the voltage drop is less severe due to lower power consumption.
And ditto on the Light Tree. The bulb in the light tree is not a small 3157 with a wire filament thousands of an inch thick. It is a much bigger filament and will take longer to reach full illumination. Also the control relays are being controls from the tower at the dragway, which means a portion of the delay can still be pinned on the design of the system and the length of wire used to control the system. The relays in the system itself probably have variation in response time that is measurable down to the 0.0xx seconds, although these would still plague the LED light system at the end.
Not to mention the incandescent emits enough light from 0.02 seconds to be seen, and they the graph is skewed because I would love to shake the hand the guy who build an LED turn signal that emits a perfectly square impulse, and obviously that circuit lacks any use of a resistor to power adjust the power levels for the LEDs :-)
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