I'm late into this discussion; have little experience with container gardening and even less with indoor. Still I'm curious about a couple of things:
Akhnaten, (sun-worshipper? A friend has a statuesque dog called Anubis) - when I grow pepper, basil & coriander in the garden they all grow quite tall, especially the coriander. I call it that because I'm not very keen on the flavour of cilantro - likely it's an 'acquired' taste - but I love coriander; now there's a puzzle?
Anyway ... my coriander plants get 2 to 3+ feet high, skinny stems with very little cilantro foliage but lots of seed. I grow them in tomato cages. Peppers & basil are more like 1.5 to 2 feet and fairly bushy, specially the basil. So I have a couple of comments/questions; maybe for the forum since you yourself haven't grown them in the ground....
Aren't the plants in these photos relatively stunted by comparison with garden-grown specimens? And more generally: How is it possible to give adequate light from overhead, to tall plants? I'm used to raising early transplants under fluorescents where it's commonly advised that the lights must be only a few inches above the plants. But how well can a plant grow when all but the topmost leaves are distant from the light? It's something I've often wondered and this thread brings it up for me. Oh, and is there a particular variety of cilantro that makes lots of foliage? mine doesn't.
"Ak," (if I can be so familiar) you said 'sorry this is Europe, metricland'. I'm going to post a little ramble about metric/imperial back-&-forthing in the Non-Gardening Related Hoo-ha and Foo forum, just for fun.