Thorn Gamma 6 18w SOX: Two years on.

Been up for two years now, doesn't look too bad.
The blackening around the electrodes which was there from new had faded quite a lot since last year and there still doesn't appear to be any sodium loss to the outer jacket.
What appears to be a crack on the discharge tube near the left electrode is just a mark on the inside upon closer inspection.
This was the roughest looking lamp out of my batch of 6 too.