I calculate that we'd need over 100 LED spot lights (at about 200 lumens each) to get 500 lux in the big room. That's £1000 of light bulbs! So now I'm considering fluorescent bulbs (T5) concealed behind an architrave or coving.
Altima have an all in one solution, but frustratingly, they don't say how bright it is. PJ Engineering have much simpler luminaires, but then I'd have to construct my own coving - and I'd have to make my own reflectors too.
In any case, we'll also need some spots for detail lighting. Dimmable fluorescent tubes would be good too.