The 1l-x is an hl-x lite - Streamlight ProTac Rail Mount 1L-X 500 Lumens LED Weapon Light

Streamlight doesn't disappoint. This 1L-X is a lighter, more compact HL-X. Only a bit larger than the original Protac Rail Mount 1, but has noticably higher output. This model came with an aluminum MLOK offset mount. I've owned handheld and weapon mounted lights from Streamlight since 2019.