Author Topic: MH electronic ballast whine/whislte  (Read 3634 times)
sol
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Re: MH electronic ballast whine/whislte « Reply #15 on: October 14, 2017, 08:01:37 AM » Author: sol
Under normal conditions, yes. However, this thread seems to lean towards very small defects in said electronic ballasts which make this whistling sound without otherwise affecting performance. Of course, they're not supposed to emit audible sounds but that would be in a perfect world.

Interestingly, I have started to take notice of this in a more active way and I found something. I have several MH electronic ballasts in use, two of which are full case and three that are small case (intended for small track lights). The bigger ones whistle (although not always) and the smaller ones don't. I wonder if the larger case amplifies the sound, or if it is just a coincidence.
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suzukir122
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Re: MH electronic ballast whine/whislte « Reply #16 on: October 14, 2017, 08:12:36 AM » Author: suzukir122
I don't know why my PAR38 does this high pitched whine, but it does... although it silences itself a little
bit once the lamp has warmed up to it's original color temperature. Makes it all the more weird to me.
My 3 tracklight MH's all seem to be silent.
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