MH bulbs are way over price. There are much cheaper bulbs out there that will do just as well an not any where near as expensive. I am always into cheaper way to keep aquarium so this is where I got all of my MH bulbs over the last several years.
I have used bulbs from here for the last several years without any problem
http://myworld.ebay.com/trust_deals/
You can get all the MH bulbs for 19.99 each with a few dollars shipping. That is a whole lot better on my pocket than 60-140 per bulb

Certainly it does not cost any more to produce a 70 W VS 1000 W. It does not cost any more to produce one spectrum of color over an other as the metal go into each of these bulb is tiny. One can argue that all the research going into these bulbs entitle the producer to charge more for the bulb they produce. However with Mass spectrometer, one can copy the amount and the composition of the gas go into these bulb very easy, thus one company can copy and produce the exact spectrum of another company's bulb very easy. I think this is what these people did. Certainly my 14000K/10000K and 20000K MH works great. Muvch better than the stock bulb that come with my Orbit MH fixture.

Just a note to let everybody know about this. I certainly have no tie whatsoever to this company other than bough about 10 bulbs from them over the last several years.