http://www.isnare.com/?s=author&a=Mark+P+Hudson Gardening Mark P Hudson Fri, 28 Aug 2009 00:00:00 -0700 http://www.isnare.com/?aid=403688&ca=Gardening While it’s true that HPS bulbs and metal halide bulbs are both high intensity discharge lights, HPS lights produce a more efficient light that has a more ideal light spectrum for growing. 10 percent more efficient than metal halide lights, HPS lights focus a very bright reddish yellow light and comp...