It isnt so much quantity of fittings, as positioning. Position over worktops so there arent any shadows, same for tables etc. No real need for excessive amounts in other areas.

I fitted some of the 13w low energy ones over the desk in a Leisure centre, and they worked very well. I'd say that no, they arent as bright as the typical spot, but I'd say most of those are excessively glarey anyway.

I also think that the low voltage 12v/50W types are brighter than the G10 240v versions.

But different lamp designs can also affect that.

Trying to find a link to the low energy types, but cant find any. The ones I fitted used a 13W PL tube, mounted vertically downwards. So they only appeared to be circa 75mm diameter on the ceiling. Offered a more subtle light than conventional spots