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【Wide Low-Voltage Compatibility】P13.5S standard base with negative earth polarity — compatible with 3-18V DC flashlights, including 3V penlights (2×AA/AAA), 6V lanterns, 9V devices, and 12V work lights. Confirm the polarity before ordering. 【Bright 100LM with Minimal Power Draw】Delivers 100 lumens bright output from only 0.5W power consumption — extends battery life significantly, especially for 3V and 6V systems where every milliamp matters. Runs at 0.03A at 12V. 【Miniature Size Fits Tight Spaces】Ultra-compact 23mm length × 10mm diameter — fits snugly into small flashlight heads and tight bulb compartments where larger LEDs won't go. Simple pull-out, push-in installation. 【Tool-Free Plug-and-Play Installation】Simple 3-step swap: unscrew the flashlight head from the body, remove the retaining collar and old bulb, then insert the new P13.5S LED bulb. No wiring, no soldering, no special tools required. Fits snugly into most standard P13.5S bulb slots with its compact 23×10mm size. 【12-Month Warranty with Hassle-Free Support】Backed by 12-month manufacturer warranty — if any defect occurs, simply send us photos of the product and we will arrange a free replacement without hassle. Choose Yellow for camping ambiance, or Bright White (6000K daylight) for workshop clarity. Multi-pack options available for backup and bulk needs.