Actually not true. Supposed to be that way, but if you watch a slow mo video of the tree you will see that the lights progress from top to bottom. I find that if my lights are slow I stare at the top bulb. If they are to close I move down the tree to the bottom bulb.
With the old incandescent bulbs this statement may have some validity, but with modern LED's there is not a perceptual difference between the 3 bulbs firing.
