If you're still looking for a venue, bearing in mind you asked Lingfield, try a couple of other racecourses.
Kempton Park (Southwest London) and Wolverhampton (mids) both have the facilities to be lit at night, they have the same sort of allweather surface as Lingfield.
Southwell (mids) also has the same layout, but not sure if is has floodlights. Am not sure of the track distance for any of these but it may be of some help.
My apologies if you are looking for a venue specific to the Lingfield area, but I just thought I'd post those suggestions incase they are of any use. 
Good luck!!