You mean half the width of the room? You mean a light that, at its shortest, will be barely 5 feet off the floor in a room with an 8-foot ceiling? You mean guests hitting their heads on it when they stand up?

Clearly.

You hang a light over a table. A 30 inch wide light, needs a table 48 inches wide. If you have that? You cant' walk or sit around that table in an 8' wide room.

12+8=20”. Start with that width. With a 20” wide fixture your table needs to be at least 36” wide. If your table is wider than that you won’t have enough room to push back chairs (need min of 30” but 36” is better). With 8’ ceiling and a standard height table of 30” plus 30-33” from table top to bottom of chandelier you 33”. Figure a chain drop from ceiling of 6”-8” your chandelier height can’t be more than 26-28”. With this size room, have you considered a banquette on one wall? Might work better space wise.

@Michael - The furniture will be delivered Thursday so I will take a photo and post it on the site.

What is size of the table?

OMG, I am so sorry. The room is actually 12' x 20'. It is only walled in on 3 sides. The 4th side has a 4' walkway before it touches a wall. The table is 42" x 108"

info found online:

For starters, remember that lighting from a chandelier, no matter what the setting, should make a room, people, home furnishings and prized possessions look their very best. So it’s important to hang the chandelier in the right spot and at the proper height for
maximum impact.

• A chandelier in a dining room setting should be positioned in the center of the dining table and room proportions.
• Avoid purchasing chandeliers that are larger than the width of your table, as people may bump into it when getting up. A handy rule of thumb is that a chandelier should be 12 inches narrower than a table and have at least 48 inches of space from each of the room walls or edges.
• Hang a chandelier approximately 30 to 34 inches over a table with an 8 foot ceiling height. If your ceiling is higher than 8 feet, mount the chandelier an additional 3 inches higher for each foot of ceiling.
• Keep in mind that lighting from a chandelier that beams directly onto a person from above can cast unflattering facial shadows. The heat from bulbs directly overhead can also be uncomfortable.
• Avoid high wattage bulbs. They will increase the heat and cause excessive table glare.

Wow! That is so much different. With those measurements, the 30" chandelier would work width wise, but I have to go back and check on height. The table fits with good chair push back space, but no buffet space is obvious. So, I will go check on the height of that chandelier you posted.

OK, the fixture is 30" wide so that can work, but it is 28.5" high with the post. That might be too tall. Do you know the height of the table? If this was on a chain, you could adjust it, but on a post it becomes more difficult if not impossible to adjust that post. If you can find the fixture on display, you could do an actual measurement, because I never totally trust dimensions posted on site. One other concern. There are 6 light bulbs each 25 watts. That means a total of 150 watts which is not a lot of light. Might be fine for a dining room. Also, how do you change out bulbs? How do you clean those globes? That is something to also consider.

if your table is 108" long / 9 feet then you might think about getting a linear type of light fixture as if your fixture is square or round then there will not be enough light at the ends of the table or even 2 smaller chandeliers - found online: If your dining table is long, consider hanging two fixtures instead of one. Choose chandeliers with a diameter one third of the width of the table and hang centered on each half of the table.

Make sure that someone at least 6' 4" can walk UNDER it without a table. Trust me on this, as I have put new fixtures in many, many dining rooms and SO many hit their heads on these. You can have whatever you want so long as it is proportional.

I am working on a mid century dining area in a large living room (L-shape, with the short side the L being the dining area) and I used an 18 bulb chrome sputnik that is kind of flat (so it doesn't hang down too far, and is on an adjustable chain). It's perfect, with half chrome bulbs so the light isn't in your face. Like the link, only I got a chain since I had a hook a foot or so away for the old fixture. Looks fabulous. This one is 24" wide and hangs 15 inches down if you use the post, and I have it a tad lower. Could not seem to post photo but here the lamp is.

https://www.inmod.com/retfursputch.html

I really wanted a linear fixture. This is what I really want but just can't justify the cost in my mind:

https://www.restorationhardware.com/catalog/product/product.jsp?productId=prod10790083&categoryId=cat10160066

I love the fixture because it looks like a soap bubble with the sun twinkling inside. I was thinking the less expensive fixture was linear but it probably isn't that linear.

The fixture you posted appears like a square basically.

1 True linear or 2 smaller ones would be best fit for a 9 foot long table
The first is a linear Sputnik
the second a liner globe style
Find your budget and look in your price range