HPS is too orange. I think your friend's MH bulb was a low temp bulb. We're talking 4000K bulbs with a CRI of at least 65, it may have been 3200K or lower. Ideally, we'd use 5200K bulbs but they aren't very common. However, Ushio does make a 5200K MH conversion bulb (85 CRI) that is intended for HPS ballasts. It's the best available right now, but it isn't easy to find. I'd use one but I've already got an MH ballast on the way so I'm stuck with a 4000K for the time being. I've been told the 5200K Ushio is compatible with MH ballasts too, but I'll wait for a definite answer on that.
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