Mag-Lite Rechargeable MagCharger Flashlight System Halogen Lamp. Fits in the Maglite RE1019, RX1019, RN1019, RE1016, RX1016, RN1016, RE2019, RX2019, RN2019, RE3019, RX3019, RN3019, RE4019, RX4019, RN4019
Manufacturer part number: LR00001, 107-000-437
This new 51,700 candlepower bulb is more efficient AND brighter than it's predecessor You can tell if you have the new bulb by looking at the 'arms' holding the filament. If your bulbs 'arms' are bent at a 90 degree angle you have the new bulb. If your bulbs 'arms' are straight you have the old version.