I have just tried the 175w Iwasakis today and I have to say they are amazingly bright and this from someone who has been using 10k xms (the xms were going on 2 years old though
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Some pics
Still not as nice a colour as vhos but better then any other MHs I've tried but they have only had a few hours burn in time hopefully it will get even better. Now I wish I had gone for the Iwasaki 250w DEs as well