are we to provide design the light layout or is it usually the electrician who will come out with the design? Is there anything we need consider when if we were to go led? thanks

You can ask your electrician to suggest.

You can also ask at the lighting shop for advice.

Are you talking about downlights? Or normal ceiling lights?

I just did my agaration, draw out and asked my contractor if the light is sufficient, he say ok, so we go ahead lo.