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The noise just started today, sounds like the noise it makes when first turning on. (Rattling, high frequency noise.) But has been going on for hours now. I've used the light on 1 previous grow and this isn't normal for it.
Dimmable ballast, when I drop it to 75% the rattling stops, 100% and it's back. 400w bulb for 400w ballast so that's not the issue. Any ideas? Old bulb?
I believe there are 2 chambers in the bulb and before it is about to shit its self it becomes loose, however the bulb sometimes will rattle for a month before it does finally pop. Globes do also make noise when moved and the power gives it a noise and that noise can vibrate making the parts hum and rattle. powering down to 75% will reduce the noise hum I wouldn't worry. Only ever worry if the glove is cracked and it still works then you should turn it off immediately and don't go near it.
-------------------- I eat animals and most things that live in the sea, I'm not green but I smoke it and I litter to keep cunts like you in a job so fuck off.