Some people get uneasy when introduced to something unfamiliar to them. My sig other says LED and CFL light makes her "uneasy". Based on other observations, I believe some people do not like anything that saves money, especially if they do not have to earn that money. Change is BAD!
Arminius - the building management peeps where I work have been slowly changing out lighting over the past few years. If someone "catches" them, there are a lot of complaints. If they manage to do it over a weekend and none of the workers know, complaints are few. FWIW IMHO most of the complainers are people who spend more time working on commitees and events than the J.O.B.
(boy, am I gonna get it now from some sectors)