Shipped quickly and product is good quality. Quickly plugged it in to test and it's genuinely very bright with good spread (I bought the warm version). Only downside is the rubbish neoprene bands to secure to bike. The light is too heavy for it to stay and on a mountain bike it rotates down. Needs a proper clamp fixing, which I'm investigating. The bracket is secured with 1 screw so should be possible to replace it with something else. Overall very happy with it though!
Very powerful lamp. Of course it is not 5000 lumens, but I'd say it's 2000 at least. The housing is very sturdy and quite heavy. As the attachment point is not in the middle, it might be that the lamp tilts when riding in rough terrain. The lamp is not waterproof, I would't use it in rain. The O-ring on the front glass is too thin and flimsy to properly seal the lamp. I think this could be fixed with some kind of sealant. Same goes for the hole which the cable goes through.