I ended up sending one of the original 150W HQI bulbs that came with my 48" 150W Aqualight Pro unit as it was buzzing quite loud. I guess there is always a chance of receiving a lemmon product. I tried searching the net for any discussions about problems with 'any' of the Aqualight products - couldnt find any... Oh well, I feel better, I was thinking it would of been a more serious problem more frequently.
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