LEDS Bullet pixels work well with most props.
LEDS Square pixels are best suited for mega tree strip or matrix mesh.
LEDS Seed pixels are a fairly new product. They can be used on roof lines, leaping arches, mega trees if supportted properly.
LEDS Led strip works well on roof, window and door outlines. It works well on arches as well.
LEDs are usually 12V or 5V. 12V LEDs can typically go further without power injection. 5V pixels are more efficient. 12V take .6 watts at full white while 5V take .3 watts at full white.