Product Description:
65W, Bronze, Fluorex Security Flood Light, Lights Up To 2580 SQFT, Dusk To Dawn Operation, Color Corrective Blue Rich Full Spectrum Lamp Provides Superior Light Quality For Night Vision(available in red as well), 70% More Efficient Than Mercury Vapor, 40% More Efficient Than High Pressure Sodium, Operates In Temperatures To -20, Instant Strike & Restrike, No Ballast Hum....
i think it only says its more efficcient then MV and HPS because the MV and HPS temps are way higher so u have to have it further from plant... the flourex light isnt that hot so u can have it up next to the plant.... so it actualy equals out pretty good... its either temp or distance in this problem.....