When evaluating Tiffany floor lamps, the most critical component is the lampshade material. Ensure it is made of genuine stained glass rather than plastic; this can be verified by the 'tap test' (glass produces a crisp sound, though it may sound dull when foiled) and heat resistance. The soldering technique should use copper foil with smooth, uniform lead or tin lines. For the base, prioritize zinc alloy, cast iron, or resin with a weighted core to ensure stability and prevent tipping. Additionally, verify the socket type (e.g., E26/E27) and ensure it supports the wattage required for your target market's illumination needs.