I wouldn't have said that using different imagery (in this case, feeling weightless and light) as being necessarily "reverse hypnosis". In fact, when I clicked onto this thread I thought I'd be looking at something regarding inductions I've seen before, where the hypnotist literally plays Devil's Advocate in order to get the subject into trance. But, that's another story.
Whether it's 'weightless and light' or 'gown down deeper into relaxation', or even (as I sometimes try to do, especially with hypnotists) avoiding as many words connected to stereotypical inductions as possible - it all works to achieving the same aim. It's not reverse in this respect, as the subject is focusing on the feeling of weightlessness, of drifting upwards. The connected connotations with this are usually pleasurable (unless you get a really responsive subject afraid of heights), as they echo things like the sky, air (and then of course, breath/life) and Heaven (/levels of happiness and elation). We cycle through these things unconsciously, with little more than a fleeting thought as we respond.
So an induction that focuses on this will still follow the same things as any 'normal' deepening induction. There will be sensation throughout the body (weight and sluggishness for deepening trances, and weightlessness and floating for uplifting ones). There will then be the feeling of relaxation associated with either of the two. Whether it's eyes open or eyes closed will only affect the subject if they have preconceptions about how trance should work (if there is such a thing). Then again, this image can be cast aside just with the confidence emitted from the hypnotist. The subject will latch onto it, and follow just as well as any other induction.
So, to cut my long-winded ramble short, I don't think it matters what kind of imagery you decide to use. Whether it be floating and light, or sinking into the sheets of your bed after a long day (one of my personal favourites as it ties in the relaxation with a feeling they can relate to, one of coming in after a long day's work and longing for a good sleep). I think it all boils down to the main thing about hypnosis really: "Fake it until you make it" regardless of what induction you do, there's an argument that with a good bit of smooth talking on the part of the hypnotist, you can convince the subject they *are* in hypnosis. From there, it's much easier to evoke responses.
For those of you familiar with the writings of Terry Goodkind, it's the Wizard's First Rule