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Thanks for the reply. I did try and tighten the bulb this morning so it may have been that, it's been switched on about an hour now and not gone off so hopefullly it's sorted. Thanks again.

All of a sudden it's started working today, not done anything with it. could it be a loose wire or something?

Hello, I have a problem with my ballast if someone could help me. I plug it in and my bulb comes on but it only lasts about 45 seconds before it goes out and my ballast starts buzzing. It's a brand new ballast 600w never been used before and my bulb is a 600w hps. Any ideas would be...