Quote:
Originally Posted by GanjaGardener
I noticed it flickering on and off for about a half an hour the other day as well. When i looked at it just now it was making a small whistling sound and was barely on is it just the bulb or somthing else
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I don't see how the bulb can make sound unless there's air leakage on the glass envelope; I'm willing to bet it's the ballast. Was this HPS purchased new recently? If so, it may still be under "walk in & exchange" time frame of store you bought at. In the meantime, keep as many flouros/CFLs going as you can.