I got that same holster for my S70, which is a very similar size to the L6, & although the light will fit in the holster, the flap will nowhere near close as the head is to big.
If I remember correctly others have reported the same problem with that holster & the L6.
Here is the link to the L6 holster thread Holster for L6?
The Acebeam K70 holster will fit the L6 but it is expensive at over half the price of an L6 itself.