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Change them, keep the old ones. When your new ones hit life expectancy, swap them out until you buy new ones. As far as the mix, I don't know. I know the 10k and actinic mix is common, but the dual daylight is something I haven't seen. I'd probably put mix actinics and 10k's in the 36, and purely 10k's in the 48".
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-Jeremy
"Quidquid latine dictum sit, altum viditur"
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