I can only report good for this flashlight. Extremely bright, good workmanship closed thread with gaskets. Overall impression is very good. Some here have the hunger of the lamp criticizes something, well let's face it, where power comes out must also pure power .... Take simply equal to 26650 he. Instead of 18650 and the problem is solved Here the TR-J18 offers even a treat and although an extension to operate 3x 3x 18650 or 26650 The best comparison test can be found at Traumflieger.de and because they can, even if it is something ridiculed as chinaware, very good points. Remember never please the price for real there's nothing better!