How bright is The PR6 Bulb? Is it a MX991/U? If so, it states waterproof, but so vague? how water resistant is it? i read that the u designation for underwater does that mean it can be submerged undewater? if so, what is the maximum depth and duration of water exposure it can withstand? Lastly, how bright is the bulb? can it bright enough to do mechanical work outdoors when the sun is shining? thanks for answering like the acu camo flashlight by fulton but no specs available on the official website need help.