I think something that will effect what you're talking about is how the types of lighting are attained. With mh and T5 you have a few bulbs in a setup. The bulbs aren't going to get much cheaper. LED units contain hundreds of these repeating parts and their cost I would assume will drop quite a bit from where they are now. With there being so many of them in a unit their unit price doesn't need to go down that much for the overall price to be affected a lot.
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