I don't know about architects involvement either - but there's no doubt that there's been a huge improvement in recent years in the understanding of lighting in new buildings, it being used very effectively, especially in interiors - although certainly not in all cases.
I've been interested in lighting for years, both in the entertainment lighting you speak of Plug, and the more practical forms, ie, street lighting etc.
I cannot believe the state of the Custom House's floodlighting, its a joke. Many of the floodlights bulbs have just been replaced after being being blown for months and months, but its the architecture of the lighting thats so bad.
Horrible urban orange light is used, the lights are positioned on the back of lamposts and so blast concentrated light on only certain areas of the facade, leaving other areas dimly lit. The portico is then ludicrously lit with white light beams that jarr with the orange light.
The drum and dome are also lit in different colours to the rest, and again are too dim.
And then throw in the amount of blown bulbs there are and you end up with a big cluttered incoherent mess.
And as for the Four Courts - the OPW can't even be bothered to replace the bulbs that light the dome in the same colour - hence one part is orange, another white etc.
And as for Christchurch, Trinity, the GPO, Leinster House, the Ntl Museum, Library, Gallery & Natural History...
Leinster House being the most recent job - I can honestly say I've never seen anything so ham-fisted and pathetic in my life. The OPW should be ashamed of themselves.