For the last days when my hps bulb 400w on a digitalballast is turning on i hear a whistling noise but it goes away after some minuts is this something i should worry about? maybe bulb is failing? / Flodas
but its only in the startup phase then it goes away. I have never experienced this buzzing noize . I really dont like to buy more bulbs since i got 3 weeks left then im going over to LED lights.
I run 9 - 1k lights. Every once in a while one whistles. I honestly let it go. I've changed the bulbs but still get a whistle in one or two. It's not enough of an issue so I let it go