please note your quotation is from the seller's promotional advertising, and uses the frequently-abused terms "up to" 10%, and "up to" 36% ... in real-world growing, I haven't found anyone yet, that thinks the Hortilux is any better than a standard HPS lamp, and my Hortilux supplier warned me that they have had very poor life from the 'EYE' brand of lamp (Japanese manufacture) ... hope this helps ... :smokin: