Something I noticed lately as well Jeremy - at least on a 12K Reeflux. When the nipple is up there is a bar that splits the "hot spot" on both sides of the bulb. It seems the left side on both my bulbs as well as yours are usually a bit hotter.
The Bishop,
We tested under the bulb, 6", 9", etc. I am not sure if we were directly under the bulb or an inch to the left or right - all measurements under the bulb in a 2" radius were in the high 500's for the LumenBright and high 200's and low 300's on the LumenArc. Hopefuly that helps. 
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156g - 2-400W 12K Reeflux Bulbs - CV Ballasts - 2 Large LB's("every inch counts..."), VTech MP40W, mjmod 1200, Reeflo Dart, Octo DNW-200 w/ mag7, Eshopps 37g sump, RK 2, Ltrmtr + 1 for top off/alk-ca
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