In message o.uk, at
12:01:47 on Mon, 23 Sep 2013, Dave Liquorice
remarked:
Not the only example, they also say they are using LED lights in their
(semi-underground) car park to save energy, but it's obvious they are
fluorescents.

Are you sure? There are LED strip lights that fit standard florry
fittings, not sure it would be very easy to tell what the light
source is behind a diffuser...

Wouldn't they have numerous point sources visible (if only with a few
percent difference in brightness), rather than one long source?
--
Roland Perry