I fired up two 400 watt Iwasaki's side by side. One using a Sona Agro 430 watt HPS ballast(Commonly referred as a HQI) and a regular M59 ballast. I could see very little difference in brightness and whitness between the two. The Iwasaki on the Son AGro side might have been a tad brighter, but that's about it.
I will try and post some pics on the weekend.
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-=Bryan=-
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