Hey guys... im on my 3rd grow...my first 2 I had issues with light burn..so this time I bought a apogee par meter..im jus at the end of week 3 flower..im running a spiderfarm sp4000 light is 20 inches away from the tallest branch and the dimmer was at 80 percent. I was running a par level around 600-700 at canopy level and already some of my hairs are turning brown. Iv lowered the light dimmer to 60 percent 550 par levels now. shouldn't my plants being able to take more light by now? Does par from a led or hid light different? Temps 80-84. Co2 at 1600-1400 ppm.
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The plant looks fine. I don't see any light burn. Check your fans as constant wind is likely the culprit for turning the pistils brown as this stage.