Good, cheap underwater backup torch. There is no compromise between quality and price, especially in diving equipment.
Good underwater torch will cost about 150 - 200 USD/ EUR. Professional lighting equipment for diving on the wreck or cave to a few thousand USD/ EUR.
The company introduced a flashlight MacTronic Dive-Pro. It is a flashlight mounted on the head, which of course in diving is dangerous. However, you can install it on your hands (bar) or BCD. Shines a very bright light, I used it for 4 night dives- still shines without changing batteries. Cost flashlight is about 40 - 50 USD. Quality-as-super in comparison with cost of this torch. Ideal as a backup, I sometimes use it as the main torch.
Specifications: MacTronic L-HLS-K6. Headlamp Dive-Pro is designed for cave explorers, divers and rescuers. Waterproof to a depth of 30 meters. LED Luxeon Rebel 100 LED produces light of 200 lumens. Used in the construction materials are resistant to damage, corrosion and chemicals. Flashlight has a magnetic switch for easy operation in the water. Two possible modes: constant light and SOS signal. Case color fluorescent yellow. The warranty for two years. Very long burn time on one set of batteries-2.5 hours. Lamp powered by 4 batteries R03/AAA. Weight 180 grams.