The Collaborative International Dictionary of English v.0.48:

Lux \Lux\, v. t. [Cf. F. luxer. See Luxate.]
   To put out of joint; to luxate. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

lux
    n 1: a unit of illumination equal to 1 lumen per square meter;
         0.0929 foot candle [syn: lux, lx]