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the system runs at 110hz also woudn't a harmonic damage (resonance) the bulb

bulbs is universal and it's 50hz cycle in aus

4200k and the bulbs are brand 'new' and 'no' dimmer is connected

315w cmh phillips advance ballast

electronic ballast and it's the bulb thats making the noise

my bulbs make a high pitched khz one tone sound(eeee) constantly it's giving me a headache is their something wrong with these bulbs using mogul 4200k bulb phillips ballast i've checked all the connection and changed the ballast over to another one but they continue to do it