T-1 3/4 Sub-Miniature Flange LED Replacement Lamps VCC T-1 3/4 Sub-Miniature Flange LED Replacement Lamps deliver improved illumination, durability, and long life. The T-1 LED lamps with a flange base are drop-in replacements for filament lamps typically used within pushbutton switches and indicators. These LED replacements for incandescent lamps come in various colors and voltages and are ideal for mission-critical applications. The LED lamps use up to 90% less energy than incandescent lamps and operate significantly cooler than traditional lamps.