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Yeah, they were new tubes. I've been to Wickes already - got a replacement. Job done, old (2yr) unit in the bin!

Hi, Well that's interesting to know. Anyway, I re-wired and tested and all worked perfectly! But... After the initial test I put the unit and cover back together and turn on. Both tubes came on and I turned off while I cleared up. Turned the light on after I was finished and both...

Wow, that was quick! Why are there a number of ways of doing it? Just as a matter of interest?

Hi, I'm stuck. My old ballast has 8 connections, 4 for each tube. The replacement ballast only has 7 connections and one of them appears in the diagram not to be used at all. So I need to know how to re-configure the wires from 8 to 6 connections. Would appreciate any advice!!

Old and new ballast diagrams

Old and new ballast photos

Wiring diagrams