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Hi Christopher, lumens is the only difference. HL stands for High Lumens. It is engineered to produce a longer reaching, tighter beam. Stay safe & have a great day!

Hi Christopher and welcome. Just the lumen power difference and rechargeable battery on the HLx. Cheers, stay safe and enjoy! https://www.youtube.com/watch?v=CyTpd9A4FlI

They both will accept rechargeable batteries. They accept either Streamlight's SL-B9® USB-C rechargeable protected lithium-ion battery pack or a single CR123A lithium battery.