I'm quite familiar with INOVA lights you're talking about. Inova makes a wide variety of LED-based flashlights. My local Fry's chain has carried them for years... I own a couple of them, as well.
The switches are NOT the same as the INTOVA lights we've been discussing. Those tail switches are a simple exposed rubber membrane switch. I don't believe the lights are actually designed for scuba diving, in spite of their ostensible "waterproofness". I'd be perfectly comfortable using one in a rainstorm but I'd never take one diving. The Intova light switches are protected in a very different manner. I'm not sure about interior mechanism, but there is a hard cap protecting the switch.
I've had the Intova Compact light over 120' a number of times, with no self-actuation.
Just to clear the air. They may seem similar, but they're not, so your experiences with the Inova lights have very little to do with the Intova lights discussed in this thread.