Careful before you buy it; it's clearly aimed at the L4 but I don't see any info re regulation, lockable TC, pyrex bezel, verified lumens, etc. HA is only type II; that "epoxy coating" is just a coating, very different from HAIII which creates an electrochemical aluminum oxide bond. There are questionable L4 comparisons regarding output and weight:
"It is much lighter than other flashlights in its class, a mere 3.7 oz. including the batteries"
L4 is 3.4oz
"Makes a great substitute for more expensive tactical flashlights made by SureFire. In fact you can't get this much light output from an LED model from Surefire"
They illustrate this with non applicable examples, rather than with any 5watt SF LED.
True, you'll save some money on this light, and it might turn out to be excellent. Just make sure the site has a good return policy .
Brightnorm