It's not about what has the most photons, visibility is determined by how well the cones in your eyes pick up photons of a specific frequency. IR and UV are made up of photons as well, and no matter how much IR radiation is present in an area, you still can't "see" them without some kind of an instrument designed to convert them to something you can actually see.
That would actually be the blue spectrum, hence why coral use primarily actinic bulbs. The tighter the wavelength, the more energy required to sustain it. That's why deep water coral tanks use blue spectrum bulbs, the blue spectrum is the only one with enough energy to penetrate that deep into the ocean.
This is one of those hobbies that encourages a surprising amount of learning. You'd be surprised by the collective knowledge of the stoners floating around here; there's some very intelligent people hanging about if you can catch them at the right moment. lol
No offense taken, it's the internet; people tend to react a bit more than they would elsewhere, myself included. Your idea would work for growing, in theory; I just wouldn't expect nearly the efficiency you were talking about before. Camouflaging your normal grow would likely be more effective and yield better.
Keep in mind that the best survival method to find water in the desert is to put a tarp over a hole, there's a lot of residual moisture in the ground, I'd bet that you risk a lot of condensation at night.
The lights would retain a lot of heat. Water is an amazing heat sink. A bottle of water is going to stay warm for a good while after the sun has gone down. Not to mention the rather conspicuous nature of a bunch of soda bottles sunk into the ground.
Do you seriously mean that you still haven't disregarded the idea of using these for growing weed? Sorry for the harshness, but if you're not a troll, you are one of the most retarded persons I've ever seen.
