"Basil Jet" wrote in message
...

Fairly common nowadays in the big stadia where the all round stands
initially led to the grass surface being absolutely useless for large
parts of the year, and led to re-turfing mid season at quite a few
grounds.

Thanks. The fact that they are concentrated in the northern half makes me
think not.

They are definitely artificial lighting. Have a look at this website for
instance:

http://www.scottishrugby.org/aboutus...t/view/502/75/

These things once in the ground will stay for quitre a while between games,
whether they happen to be on or off at the time pictured...

Paul S