Which circuit style of holiday (christmas) lights would be best to have and why?
mini lights

The best circuit style of Holiday (Christmas) Lights would be Parallel circuit.

Explanation:

Because if one lights goes out all of the other lights stays on.

SERIES-PARALLEL

Explanation:

In a series connection, all light bulbs or LEDs are connected to one source and if one of the connecting bulbs burns out, then the remaining bulbs will not light.

In a parallel connection, all bulbs are lighted directly from the power source and as such, if a light bulb is disconnected, other bulbs will still light.

Therefore, it is best for a Christmas light to have a series-parallel connection in the manner of the second picture i.e each segment is first connected in parallel and then in series, this way, if a segment is disconnected, other segments would still light as they do not take power from the disconnected segment.

pe = weightxheight = 2000x1000=2,000,000joules

wavelength divides in half and speed stays the same.