High intensity lighting and Cat III
At EGKK, if all the available services on the main runway were displayed at 100% during normal viz, the pilots would be so blinded as to be unable to see to land. It's really bad when we have to have them up all the way for inspections; likewise this morning when we were brushing snow for a couple of hours (very successfully, actually, as a bit of thread creep)
Now, during normal ops, we only display the 5-bar Calvert approach, threshold green,, centreline, edge, TDZ and stop end lights at 3%. With the modern lamps we have that actually meet the output spec in CAP 168, they are too bright, even at that setting. The Supplimentaries and any increase in intensity setting are only used when necessary in Low Vis. Actually, for CAT III, where decision heights are AFTER the approach lights have been passed, you can make out a case for not having them on at all!
So, when you're talking about what lights to have on, you should also qualify it by quoting an intensity setting, too.
Cheers,
TheOddOne