The umbrella gets all the attention, but the base is what decides whether it stays upright. Undersized bases are the single most common cause of umbrella failure and the reason canopies end up in the pool after the first real gust.
As a general rule, freestanding umbrellas need substantially more base weight than table mounted ones, because the table itself contributes stability. Cantilever umbrellas need the most of all. When you are between sizes, always go heavier. If the base is meant to sit under a table, check the plate height clears the table stretcher.
A clip on umbrella light mounts to the pole or the ribs and turns a shade structure into evening lighting, which extends the useful hours of a dining table or seating group without running any wiring across the deck.