I've found that with the 14k you don't need the pc's other than for the flouresence that pc's can provide. I've yet to find where I ordered the bulbs from, but I'm still looking. I do however know that they came directly from Hamilton by way of my order thru the online supplier. As far as all bulbs not being the same I figured that was understood, hence the reference to the Hamiltons. Take a look at what you want and try to search for the same, you'll find the prices vary from place to place, and even from time to time with the same place.