Polish Philips 80w T5 HF ballast (for 8ft 85w)

Got six of these from eBay, eventually, after the seller got back from their Christmas holidays ...on the 16th of January! I bought them in December, the seller hadn't marked themselves as being away and didn't answer repeated messages. Also, these were advertised as switch-dim and they're actually 1-10v dimming, which is much less useful. Finally, whilst I purchased six, one was dead on arrival, not a good start!

Anyway here they are (well, one of them), I bought them to run my 8ft 85w tubes which apparently these 80w T5 ballasts do well.

It's anyone's guess how long these will last...