Are the standard Aerogarden Deluxe bulbs the only ones it will take naturally?

I should buy some new bulbs now, but they seem quite limited and weak for the price. So I'd rather get something native which will give me more bang, or perhaps consider buying different lighting/replacing whole hood using the cash I would have otherwise spent on the poorer AG-branded ones.

Has anybody in the UK seen particularly cheap deals on AG's bulbs? Perhaps I just haven't found a reasonably priced retailer.

For what it's worth last summer when I changed mine I went everywhere I could think of for about thirty miles and they all told me the same thing, "They're proprietary," and you can't get them any where else. If you find another source please tell us. I assume you're talking about the flat high intensity CFL's for the hoods that hold three lamps because I've found the two round ones just didn't put out enough light for what we grow.