The Flood Lights are operated by light cards, which cost £2.50 per half hour and can be obtained from any of the committee members or by emailing priorytennis.co.uk@gmail.com 

Each court has its own light unit inside the club house and is clearly marked to show which court it  relates to, (see below).

To operate, put the light card in with the arrow point first and face up, so you can see the arrow.  Once you enter the card the display will increase by 30 (minutes).  Remove the card and dispose of it.  You can enter multiple cards one after the other to increase the time you wish to play. 
Note!  Keep an eye on the lights fitted on each court.  When the red or green light comes on there is approx 5 minutes left.