Hey, i just picked up a secondhand 400w HPS setup today.
So i've been running it for about 5 hours, but i just started to notice the Bulb seems to be making a rattling noise.

It sounds like the metal inside it is shaking and tapping the glass, as soon as i noticed ive shut it off.

so is this normal? should i replace the bulb? or could it have something to do with the ballast as well?
Thanks
infotech1 Reviewed by infotech1 on . HPS bulb rattling Hey, i just picked up a secondhand 400w HPS setup today. So i've been running it for about 5 hours, but i just started to notice the Bulb seems to be making a rattling noise. It sounds like the metal inside it is shaking and tapping the glass, as soon as i noticed ive shut it off. so is this normal? should i replace the bulb? or could it have something to do with the ballast as well? Thanks Rating: 5