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It's a domestic lounge, not a warehouse or a football pitch. Ask the wholesaller? use design software? contact the manufacturer?
And it's already been designed for you by the client. Why would you want to talk them out of it?
So you fit fewer or more and the client says that's not what I wanted?
 
err on the side of a bit more light than you (or the customer) think, then fit a dimmer.
 
I wired a private new build last year, the spec called for 100% downlighters. As I had never done an job like this before I spent a fair amount of time researching this. The best advice I got was to allow 2 meters by 2 meters for each lamp. This seemed to work out ok. I also used down lighters that took GU10 led lamps so that the light level could be varied by using different wattage of lamp
 
In the old days,before the downlight fashion, a long, narrow room like this would have been adequately lit by two 100W pendants, giving a total of about 2400 lumens.
V50s are 600-650 lumens each, so a total of four will match this!
Not quite as simple as that in practice, of course. Just four would look odd, and to get anything like an even spread of light you need to make sure that the 60 degree cones of light from each fitting at least meet each other.
If you fit eight, split them up into two or three switched circuits, taking into consideration things like being able to have lights on over the seating areas, while those near the TV can be off.
 

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