4D MAG-LITE DIY LED and LI-ion Batteries Retrofit - YouTube
HQRP Ultra Bright 300Lm High Power 3W LED Conversion Upgrade Bulb for Maglite 3D 4D 5D 6D / 3C 4C 5C 6C / 3-4-5-6 D/C Cell Torch Flashlights - Walmart.com
Terralux Extreme LED Upgrade for Maglite 4D - YouTube
Nite Ize C/D Cell LED Flashlight Upgrade Kit LRB2-07-PR - The Home Depot
Maglite LED upgrade 5,000 lumen!
MAGLITE LED UPGRADE Conversion Cree 4.5W Bulb 3D 4D 6D Torch Flashlight UpLED 5060451510010 | eBay
TorchUpgrades MagLite LED Conversion/Upgrade Bulb 1300Lm 3D 4D 5D 6D Cell High Power Torch/Flashlight Cree Compatible/Replacement for MagLite - - Amazon.com
ML300L 4D LED Long-Running Flashlight – Maglite
Maglite LED Upgrade, Ultra Bright High Power 10 Watt Luminus SST-40-W LED Conversion