Quote:
Originally Posted by Rainer
I have no interest in "changing your mind". That said, I'll tell you why I have no problem rocking a pair of twist on backup lights. First, mine require just a minor turn to twist on, at which point the threads are fully engaged. To flood it, I'd need to make something like five complete turns in the opposite direction. If one cannot figure out the difference, he shouldn't be tech diving. Second, they won't accidentally twist on underwater with increasing pressure like the H Scout lights. If for some crazy reason they did turn on, my team would notice within seconds. As far as turning on in a dive bag, I keep my lights attached to my harness. They don't move until I need them and it reduces the chance of the light accidentally coming on in transport. We check our backup lights before diving. We have spare batteries. It's just a non-issue. Four, a double o-ring sealed twist on has only one means of flooding, through the front of the light passed those two o-rings. Unless you're a complete twit, you won't twist off the head of the light and thus you cannot flood such lights. They're rock solid. Taking a perfectly closed system then drilling a hole into it to add a dynamically moving switch is unideal. It's proven out by the numerous reported failures of such designs. Both the hole created by adding the switch, and the more complicated switching mechanism (compared to the simple twist mechanism) are failure points that many tech divers (DIR or not) would rather do without. As the depth of the dive increases, and pressures build, these potential failures become more and more serious.
For all these reasons, I have no interest in mechanical switch based back up lights.
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Agree 100%, I own a solus backup and DR LED 500 one with magnetic (solus) and one twist (LED 500), there is absolutely no way on earth the DR is gonna twist on or off by accident in your bag or harness or where ever else you carry/store it, it requires both hands to twist and a reasonable amount of force. The solus although magnetic its still twist on and off and
will not turn on or off without using two hands and again a reasonable amount of force. The DR, as Rainer has stated with other twists, in order for it to leak upon activation or deactivation you would need to twist it at least 4-5 turns. I agree again with Rainer I guess the magnetic switch mechanism could fail but as said that would only result in not on or not off but would not cause the light to flood. Im not sure as to the quality of lights you have seen or used but the potential problems you speak of I think would be rare in a quality light with maintained O rings and used as per manufacturers instructions. I would be more apprehensive purchasing a light with a switch on/off. Just my opinion based on my experience hope it helps.
