Tomato and Pepper plants indoor dieback

Last year when I was starting peppers and tomatoes in an indoor electrically lighted/heated area when I experienced a big yellowing phenomena in primarily tomatoes and peppers. My watermellons also suffered, but I think I started them too early, so…

Sun and Watermelon

Hello, Thank you very much for taking the time to answer my questions. 1) Is there any device I can buy that will tell me the amount of sun individual spots in my garden get (I am not home most…