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One thing to note @ CRI ... it is based upon a relative value to "standard" value of 5500 or 3500 (iirc) ... according to OEM catalog info.
Which means that a bulb with a temp of 5000 is going to have a higher CRI than one with a temp of 6500 (i.e. 5000 more closely matches 5500 than 6500 does). That being said, I'm not saying that 5000 is better than 6500 because it has a higher CRI, but rather that you won't be able to find a "higher CRI" for a 6500 bulb, because 6500 is simply "farther away" from the "standard".
Personally, I'm of the opinion that 6500 is the way to go, since D65 has its significance in RGB creation of white light. Sure, it means that you'll have to set your WB to 6500 rather than daylight, but, imo that's no biggie.
Interesting to note as well regarding CRI ... there are TWO standards of CRI that OEM is using in their lableing. I saw this in the "fine print" of lighting mfr catalogs. One for WARM bulbs and one for COOL bulbs. Sorry that I don't recall what the WARM standard is, but say it is 3500K ... then a bulb of 3200K will have a higher CRI than a bulb of 4000K. And of course a bulb of 3500K would have the highest CRI (i.e. compared to the "standard" for warm). In that regard, you could have a WARM bulb with a higher CRI than a cool bulb, even though the cool bulb is closer to "daylight" than the WARM bulb.
That being noted, it is easy for a bulb to have a higher CRI than your chosen 6500 bulb simply because it more closely approximates ONE of the TWO "standards". Knowing that ... I wouldn't let the lower (93 vs. 98) CRI deter me from the 6500K.
Personally, my research into the issue @ available options brought me to more of a conclusion that CRI is somewhat of a ... i.e. that if I've got a 6500K bulb, it is obviously not as close to 5500K (cool standard iirc) as a 5000K bulb.
That being said ... my perspective is that as stand alone, I'd prefer the 6500K (D65). But, if I wanted to consider the viability @ mixing fluorescent with electronic flash ... the 5000K bulbs would be a closer match in temp for many flash that are @ 5200-5600 range. Also, noting that if you were also using a studio light that incurs a color shift (warmer) at reduced power (-300K ish) the 5000K bulbs would be likely closer yet.