kph is an abbreviation of the unit "kilometer per hour" and the one recommended by most news publishers, e.g. Reuters. km/h is the unit symbol of the unit kph. The symbol would probably have been more appropriate though and I definitely agree that everyone should get rid of non-SI units.

I wanted to update the page but they, understandably, do not except press reports. I can't find an independent source for the Cree results. Can you provide me with a source for the 150lm/W diodes? A datasheet maybe?

Cool. I stand corrected. Maybe update WP?

CFL and LED are very close in luminous efficacy. http://en.wikipedia.org/wiki/Luminous_efficacy

Pb is cheap, reliable, safe, doesn't need a complex battery management system and weight is not a big concern.

Where did you get that? The rules (http://www.netflixprize.com/) state:
To qualify for a year's $50,000 Progress Prize the accuracy of any of your submitted predictions that year must be less than or equal to the accuracy value established by the judges the preceding year.
You just have to be better.