all the advice i can give with the info you provided is . the plants will double in size when you flower. and your plants are to hot i can see it in the leafs. your light is making them stretch can you get a reflector for it even make a home made 1 to direct the light better to them
The light is about 6-8 inches away. I made a mistake. The bulb is *400W. I also have several small lamps with 20W LEDs hitting the undergrowth.
Thanks for your advice. Yea, I was reading about optimal distance from light to plants. I think mine actually might be too far. I made a mistake in my first post. The bulb is 400W. It's a flourescent and not hot at all. I can touch it with my bare hands (as you can see in the pic). There's also a constant breeze from an oscillating fan. What else might be causing the problem you're seeing with the top leaves?