ᐅ 3x1.5 mm² or 5x1.5 mm² NYM cable in the roof cavity for LED spotlights?

I want to run an electrical cable all around the roof box to operate LED spotlights.

What are the advantages and disadvantages of using 3-core or 5-core cables for lighting?

More is never a problem, but what do you plan to do with the five wires?

Exactly. Three are enough to turn the light on and off. Why five?

You usually only need 5 conductors for special applications like DMX, tunable white LED lighting, and similar setups. For the cable lengths involved, I would recommend using a 2.5mm² (approximately 14 AWG) conductor size rather than adding more conductors.

Maybe you want to connect a motion sensor or twilight switch later, so use 5.

Our switch setup:

1) Photocell mounted on the west exterior wall.
2) Two-core control cable from this to a twilight relay inside the circuit breaker panel by General Electric, which also contains the circuit breaker.
3) The device’s sensitivity can be adjusted with a dial, allowing it to switch on at bright light, almost never, or somewhere in between.
4) From the relay, three wires go to 5 LEDs, each rated at 1.3 watts, located under the eaves on the main entrance side. It switches them on and off: on at sunset, off at sunrise.
5) They stay on all night; 5 × 1.3 watts doesn't consume much power. Karsten