For downlights you generally start them about 600/800mm from the ceiling wall and then one every 1metre.
You will need to take into account how you intend to access the ceiling void to run the cables and leave sufficient space around the units for cooling - generally 100mm all around - definitely not near any insulation.
I have ordered and installed these and the "pooling of light" is definately reduced because of the 120 ° beam angle. they come in different colour temperatures, warm and cool (white) and also dimmable as an option
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