I'm planning on replacing all the conventional halogen light fittings in my home with LED downlights (approximately 50). However, with the current Sydney Covid lockdowns, it really isn't possible yet to have an electrician come to my home and install them. So as not to waste time, while I am home I am planning to make all the gyprock ceiling cutouts and purchase the downlights I want so that when the electrician comes, he only has to run out the electrical wiring, complete with quick connect sockets, and plug in the downlights.
I've done a fair bit of research on downlights but would appreciate input/experiences from people having gone through a similar exercise.
I have a 2 storey brick veneer home and pretty well know every square inch of the house structure as I am a civil engineer and owner built it. Therefore, I have a very good idea where all the roof rafters and lower deep floor joists are located. The house has 2.4 metre high ceilings and I am led to believe that 10W downlights would be sufficient for such a height. Obviously, though, it is the lumens generated by the downlights that determines the number of downlights and their locations in each room. For even light distribution in each room, I am planning to use mainly wide angle 110 degree dimmable downlights which will be evenly and symmetrically located. I am, though, proposing to have about 4 narrow angle feature downlights in a downstairs bulkhead, only for effect, really. The main downlights would have a 90 mm cutout, have a low profile, aluminium low heat body and separate transformers. Advice regarding the feature downlights would really be appreciated, including size, wattage, light angle and spacing. All the lights will have dimmers installed.
I have sourced lighting estimating tools online which help estimate how many lights I need in each room, and their approximate locations. Of course, this may need to be varied according to joist/rafter locations. I have been advised that the lights nearest to a wall should be located at least 900 mm from a wall and that light spacing should be approximately 1.5 to 2 metres, again, depending on joist/rafter locations. Because I am using low profile IC 4 downlights (maximum 40 mm height) there should be no problems with having air conditioning ducts running on top of the 90mm roof rafters, however, any advice regarding this would be appreciated.
I would greatly appreciate getting advice on all of the above, but especially distance from walls and recommended spacing between downlights. Also, any recommendations on specific downlights (brands, flush/recessed) meeting the above criteria would be welcomed.