voice123 said:
ya its something to do with the "f" on the lens right
lower "f" more expensive -.-
and more blur
You're keeping things at a superficial level, eventually it'll cost you money to find out.
What you described is related to DOF not bokeh.
Bokeh has almost nothing to do with f-stops. Bokeh is how the out of focus image look like.
Example, the star is a bright dot in the sky. When it is out of focus, the dot becomes bigger turning into a round disc, bigger as it gets more out of focus.
A good bokeh gives you a round disc of even brightness, dimmer but even all over the disc.
The reality is most lenses produce discs that are not round; hexagon, heptagon, oval are some shapes. This is usually caused by the aperture design, 6 blades, 7 blades, curved to try to make it round. If 6 or 7 sided shapes can be round, we won't be calling them hexagons or heptagons.
The brightness tend to uneven, usually it forms a ring like your circular fluorescent light, bright ring with dark center. This has to do with the physics of how light interacts when it passes thru the lens.
All the above can be minimized thru design and of course money.
Here's a 2000 blade aperture lens, its is way better than a 7 blade, money please.