Hi All I've had my current metal halide bulbs for about 14 months, using a 10 hour per day photoperiod. I figure it's time to replace. Any opinions on 5500 K vs. 6500K? Thanks...Mark _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo.cgi/aquatic-plants