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Upgrade your old lantern or flashlight's incandescent light bulb with the bright white 40 Lumen 4.5-6V LED Replacement Bulb. This LED is packaged with the same bulb base as your old incandescent bulb and can easily replace it without any extra effort, tinkering, or "engineering". It is inherently more impact-resistant and durable than the tungsten filament bulbs, has a life of 100,000 hours, and extends battery life by consuming less power. To provide maximum output, this LED requires 4.5-6V and works well with most 3-cell or 4-cell flashlights or 6V lanterns.