DN7Q001-S1ER is an LED unit designed for the Fuji Electric AP30F multi-display light series, providing single-color red illumination with all-surface lighting capability. This LED unit features a square (S) window configuration with dimensions of 30 × 30 mm, delivering bright and vivid red color output with enhanced brightness compared to conventional incandescent models. The unit is engineered for easy installation and color replacement directly from the panel surface, supporting voltage-dividing resistor or capacitor configurations. It is commonly used in industrial control panels, status indication systems, and process monitoring applications where reliable, high-brightness red signal indication is required.