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stripes

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    Stripes on Leaves

    Any idea what these stripes could be caused by? Plants are 2 weeks from harvest. Plants are indoor hyponics Ph:5.5 PPM 600 water temp 70 F Room Temp 75 F Humidity 50 % Using 2 700w Mars LEDs 18" above plants Lighting 12 on / 12 off Help is greatly appreciated.