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Hey everybody I have a generic chinese-made COB X5 1500W light. When I turn it on, at first all of the 5 cells light up but after about 2 seconds one of them goes out and doesn't come on again (always the same cell). I tried searching online and in the forum here but wasn't having much luck...

Hey can I get some advice on these seedlings. This is my first time growing. Only other experience is growing lettuce tomatoes herbs last year. I am concerned about the yellowing developing on one of them. I figure the yellowing is either 1. too much light/heat 2. not enough light or 3. needs...