I have two brand new 175 watt metal halide light fixtures that I got for free. There not designed for growing but they have a reflector similar to the grow lights you buy. I am currently running cfls and wanted to try running these metal halide fixtures. They will run a HPS in the same fixture you just change the bulb. I would really like to use these and I feel like I would be better off with these instead of the cfls. I guess my question is I see a ton of 4000k and 4100k lamps for sale. Is that good enough for veg or do I need something closer to 6500k? Thanks