Most listings use a Standard Edison medium screw base (E26). Maximum bulb wattages vary by model; examples in listings include 60 W, 100 W, and up to 150 W.
Heights vary by design. Example listings show lamps roughly from about 13.5 inches up to 27 inches tall, so expect models within that range.
Most listings use a socket turn (knob/rotary) switch. Light-setting options shown include 1-way (on/off) for several models and 3-way (low/medium/high) on others.
Both. You’ll find single table-lamp listings as well as multi-lamp sets (for example, listings that include 2 table lamps with shades).
Certification presence varies by listing. Some explicitly state "UL Listed," while others list "No Certifications." Always check the individual product details for certification information.