Thanks SientBob
Yes that helps...and yes, that doesn't help
Actually, it helps me make a decision. Seeing as the ranges of SPD differentiate so greatly between 10,000k bulbs, I will most likely order the light with the "standard" MH bulb.
That is unless someone can give me a concrete answer on the upgrade bulb brand.
Then if/when I go with a 10,000k bulb, I can purchase one "with" a known SPD. I don't feel good about ordering (and paying xtra for) a bulb that could be a hit or miss....I'd rather pay another $10 and get the best choice. Or for that matter, I'd rather know I didn't overlook a better choice...period.
I'd grab that Sunmaster CDX bulb, except they (meaning everywhere I look) want an avg. of $70 for the 400W!
Penguin had a good point. Throughout my search, I think I'll contact bulb sellers/mfg's that don't offer SPD info, and tell them that without this critical info, I can't purchase their lights at any cost.
I (or anyone else) shouldn't have to spend a third day now, endlessly searching for critical info, just to pick up a simple little 400W MH set-up

But...here I go on day three.
Here are a couple of interesting comparison charts I picked up a little while ago. You can see the "huge" difference between the Coralife and HQI 10,000k bulbs.
