What would cause a 8' HO fl. tube to be bright at the ends, but dim in the centre of the lamp? The installation in question is an outdoor sign. The sign ballast and 4 tubes are brand new. The 3 tubes light strongly, but the 4th is as described above. My best guess is either the cold weather, or the socket isn't making a solid connection?
[This message has been edited by Sandro (edited 12-21-2003).]
