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PostPosted: Mar 28th, '19, 23:08 
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I can't tell you for certain if your lighting is correct, I'm not an expert on indoor lighting. I have grown plants under fluorescent 40 watt shop lights with good success so it doesn't take much light. My lights were within about 6 inches of the plants - if you double the distance the amount of light hitting an area is cut into quarters.

Another thing to consider is that light at a color temperature of 6500K (on the blue part of the spectrum) is what you want for growth. Light in the red part encourages blooming. You've got both - not necessarily a show stopper but you might need more blue light.

When plants aren't getting enough light they stretch upward toward the light instead of staying compact. Their stems become very susceptible to damping off which is caused by a fungus. It looks like damping off may be what's killing at least some of these plants.

Try growing some new plants under the same lights but in sterile seedling mix of whatever you start your seedlings in. If you can get them beyond a certain size they are much less susceptible to damping off.

Cheers


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