Outdoor umbrella lights are typically attached in one of two ways, depending on the product design.
Ring Umbrella Lights - These round clasp-like LED accessories open up and close around the central pole of market umbrellas or lower hub extension posts of some cantilever models. Most products automatically adjust to the diameter but may not be compatible with wider poles. You can place them at any height you want along the pole. They should be removed before closing the canopy to prevent damage.
String Umbrella Lights - These resemble holiday lights and may be strung along individual ribs and secured with cable ties or hung from the edge of canopies by clips. If the LED bulbs dangle like icicles or have excess wiring, be careful when opening and closing to avoid tangles.