Ok, lets do this thing already!
I think it would probably be prudent to open a new topic with a different title for this particular "growdown". That way we can continue ideas here and see if people want to go with one of other "growdown" ideas.
Are we going to be concerned with growing media? (Hydro, soil, etc) I have never grown these in hydro so I cannot say what would happen, i think it would be interesting to see.
Another thing to think about with this pepper is that it can thrive a couple of different ways. I have grown it indoors in a window and it has grown very tall and spit out a lot of pods. I have also grown it outdoors in full sun, in shade, in pots and in the ground. In some situations, as you can see from the pic, it will be very compact, 18 inches tall but get 3 feet wide with very tight nodal distance. So I don't think it would be a challenge to grow the tallest one, you could just keep it to low levels of light and they will easily get 5ft tall.
With a wattage cap, it should be a minimum and not a maximum. Even under a 1000W HID, its still not as many lumens/sq ft as the good ol' Sun. I wouldn't think anyone will take home the prize for biggest crop under a single CFL though.
Another thing with the crop. I think it should be a single harvest, largest number of "mature" pods, say measuring over 1/2 inch, green and red (both are tasty). People will probably have a few early pods that ripen way before the main harvest so I think they should be allowed to enjoy them before they spoil on the plant.
Have the deadline set and I would think people most people would want to harvest everything they can that day, so it also adds a nice little factor of "who can keep there hands off the tasty little things" before the harvest day deadline.
For comparison sake, here is the one I had in an office window a couple years ago.
2011-06-15 09.31.45 by
GhostPepperStore.com, on Flickr