A solar tube variation has been designed for indoor growing. I find a company that has designed them specially for growing indoors. They have a different lens that provides whats needed to grow. The Solar Garden Solar Skylight tubes that I'm referring to can be found at tubesolar.net. It looks to me like this would be awesome. No electric bill or at least cut in half if your a 24hr grower. They say the reflective material used will bring in light even in low light or dark days so you could possibly get a pretty long growing day. I haven't ordered one yet but I'm thinking this could really be something good.
