The rule I have heard, and which I like, is that the person sitting in the chair/sofa etc should not be able to see the light bulb. In practice, I like that rule because it avoids the direct glare from the bulb. Can you experiment on height with some lamps you already have?

The first to things that stuck out as soon as I looked at the pictures of your space is the grandfather clock and those 2 big things flanking the tv. Is there enough space behind the sofa for a slim sofa table of some sort? Lastly, could you do floor lamps or any other lighting instead of the table lamps? Looks off to me. I know you said you are getting other ones to replace them, but maybe it's the placement between the chairs that is off to me. ETA: duh..sorry I just notice your post title...I see you were already thinking of a sofa table :-)

Here’s the space for my previous question

Nothing is impossible, but it will likely involve compromises. 12' by 12' can either be a dining area or a sitting area, but not both at the same time. If you're going to want to use it for both dining and sitting on a regular basis then you'll end up spending a lot of time shifting furniture. I had a similar sized room that we used predominantly as a sitting area, but would convert to a dining area about once or twice a month. In order to do that I had to create a coffee table that would double as a dining table. I ended up building a 3' by 4' coffee table where the top folded out to a 3' by 8' dining surface. I then built legs that I could adjust from coffee table height to dining table height fairly easily. It would take about two minutes to convert from one to the other. The dining table was not particularly attractive, but nothing a table cloth wouldn't disguise. For chairs, we had two wicker sunroom chairs that are comfortable to sit in and could be used as dining chairs also. We had two smaller, quite light armchairs that could be moved to one side or out of the room altogether. And we would move other chairs from the kitchen to seat the other diners. That set-up worked quite well for us, as it was for occasional dining use and for sitting the rest of the time. It was not our main sitting area, so did not need a sofa or particularly formal furniture. As I say, it involved some compromises. Without making those compromises, as Patricia says, 'the answer is no'.