I have been growing cucumbers indoors using LED lighting. They grew well, flowered and produced good fruit. I still have lots of blossoms and lots of growing fruit at different stages. Lately the leaves have turned brittle and died. I am fairly sure it isn't water or bugs of any kind. My thoughts are too much or to little light or fertilizer. Any ideas?
What is the soil type that these are growing in? Are the parts that are affected close to the light? It almost looks like sunburn. Not from heat, but intensity. I run LED myself, and this problem is common when they get too close to the light.