Kay on Instagram: "how to tell: . To tell if a neon sign is real (glass tube neon) versus fake (LED neon), check for a diffused, soft glow, a continuous glass tube with visible electrodes/wires, a slight buzzing sound, and a warmth to the touch; fake LED signs use bendable plastic, have visible dots, are silent, and feel cool. Real signs are handcrafted glass with noble gases (like neon or argon) and feel substantial, while LEDs are flexible plastic/silicone, quieter, and often have a brighter,