I know that ballasts will also make a huge difference. I run 20K single ended bulbs on a HQI ballast meant for double ended bulbs. The SE bulbs run a little hotter on the HQI ballast than would the intended DE bulbs and in turn, the colour gets shifted down by a few K. My 20K's look to me more like a 13-14K bulb.
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Do or do not....there is no try.
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