Check the listing for details. 1 Mode LED Assembly for Surefire E1 E1E E2 E2E E2D E2O. 2.7-4.5V, 1 cell setups. Condition: New. Listed at 43.50 USD. New Upgraded Nichia 519A Version!!! (March, 2023) Direct Replacement LED Assembly for Surefire's E Series lights, fully reversible direct bolt-on drop in. This model is specially made for 1 Cell battery setups (3.0-3.7V) E1-LED High Output Single Mode LED Tower Module, Generation 5(2.7V-4.5V Regulated Input)Generation 6:(Cool White) Updated to Nichia 519A LED, Fully Potted Internals.-High Output Nichia 519A LED (Max Output 420 Lumens)-2.7V-4.5V Regulated Input for Maximum Flexibility-Cool White, Cool Colour Temperature (5700K)-Maximum Current Output at 800mA-Direct Thermal Copper MCPCB-Internals Fully Potted-Reverse Polarity Input Protection-Over-Discharge Protection-Precision Machined Aluminum Lamp Assembly-Every Lamp Assembly is Pre-Focused for the Ultimate Spot Compatible with: Surefire E1, E1E using 1 x CR123A Primary Cell or 1 x 16340 Non-Protected Rechargeable Cell E2, E2E, E2D, E2O using 1 x 16500 or 1 x 17670 Non-Protected Rechargeable Cell Runtime: 1 x CR123a Primaries: ~1.5 hour 1 x 16340 Rechargeable: ~1 hour (Non-Protected Rechargeable Battery ONLY) 1 x 16500 on E2 lights: ~2 hours (Non-Protected Rechargeable Battery ONLY)1 x 17670 on E2 lights: ~2 hours (Non-Protected Rechargeable Battery ONLY)***Do NOT use "Protected" Rechargeable Battery for this LED module*** **This assembly is designed ONLY for 1 cell setups, it will NOT work on the E2 lights with a 2 cell setup such as 2 x CR123a primary cells** For the Neutral White (4000K) Nichia Version, please go here:https://www.ebay.com/itm/223228680334 For the WARM White (2600K-3200K) 90-CRI Version, please go here:https://www.ebay.com/itm/224607750881 For E Series LED Module for 2 cell setups, please go here:https://www.ebay.com/itm/322074466548